马修与玛丽结婚后，把伊迪丝当妹妹看待。他鼓励她成为一名记者，and then tells Michael Gregson he will not let her slide into a life of scandal (meaning become Michael's lover) "without lifting a finger to stop it" after learning about his insane wife, but also says Michael should use the Gillies Ball to say a proper good-bye to Edith, telling Michael he owed her that.
Matthew told Edith he would not tell Mary about Michael, but hoped Gregson made it clear what had to happen, meaning he had to stop pursuing her. Edith told Matthew "we both know what happens next" which he did not know actually meant she had decided her relationship with Michael was not over.
Originally invited to Downton as a suitor for Mary, Edith enjoyed Sir Anthony's company. To her delight, Sir Anthony is more interested in her than in Mary. They go on many drives together in Season 1. Yet when Sir Anthony was looking for Edith in order to propose, Mary takes revenge for the exposure of the scandal regarding Kemal Pamuk by making him believe the love is unrequited. In the Christmas special, a now injured Strallan forbids Edith from thinking they might be together, because he's far too old, and a cripple. She disagrees, and says that she "won't give up on anyone who calls her lovely." In the third season, she tells him she would like to see more of him, to which he replies he should like that very much, probably more than he ought to. He also tells her at one point that she has given him back his life, and she kisses him on the cheek. Unfortunately, her grandmother does not approve and tells her father to tell Strallan to stay away. Strallan is willing, but Edith is devastated. She seeks solace from her American grandmother Martha who is visiting at the time. Martha and Edith manage to persuade Robert to relent and give the marriage the go-ahead. A lavish wedding ceremony is laid on for the two of them, but at the altar Strallan chooses not to go through with it. Still at the altar, Edith is stunned, apparently unable to cope, when her grandmother Violet steps in and says that by abandoning the wedding Strallan had done "the only sensible thing ... in months". Edith is initially devastated by this experience, and seems to think she will always be alone, saying, "Iâ€™m a useful spinster, good at helping out. That is my role."
Edith gets along with Sybil better than her eldest sister Mary. Edith does not initially agree with Sybil's politics in Series One, because she believes they will cause her harm in the end. In Series Two, she asks Sybil for advice on what to do to make her feel useful again. Sybil suggests finding her strength, and Edith becomes a convalescent helper. Edith went with Mary and Anna to try and bring Sybil back to Downton when she elopes with Branson. Together with her sister Mary, she attended Sybil and Tom's wedding in Dublin. When Sybil dies, Edith is horrified and left heartbroken. She, in honour of her younger sister's memory, encourages Tom and his newly-born daughter Sybbie to stay at Downton for as long as they need.
Edith has always shown that she was jealous of Mary, because she was beautiful and easy in conversation, and thus received the majority of the attention. Edith tried to make life hard for her in season one. After Edith had been out competed for the attention of Patrick Crawley and Matthew Crawley. Edith challenges Mary that she cannot take Sir Anthony's attention. Mary proves her wrong and in retaliation Edith exposes her sister's Kemal Pamuk scandal, by writing a letter to the Turkish Embassy. In season two the sisters seem to get along a lot better with each other, probably as a result of their newly developed maturity. They perform in a talent show for the convalescents together, to which all the family is surprised. Edith plays the piano and Mary sings.
On Edith's wedding day, Mary acknowledged that they had not gotten along well in the past but that she wished Edith happiness on this day, which brought out a smile in Edith (especially when Mary gave her a sisterly kiss). Mary, like the rest of the family, was genuinely upset and heartbroken for Edith when Sir Anthony Strallan jilted her at the altar. When Sybil died Edith asked Mary if their relationship would ever get better. Mary doubted it would, but that for now they should "love each other now, as sisters should." They shared a hug.
Mary supported Edith's decision to become a journalist, but treats her editor Michael Gregson with contempt and suspicion. Following Matthew's death, Mary becomes cold toward Edith again, later saying her sister is "about as mysterious as a bucket." In 1923, when presented with the possibility of sharing a room with Edith in Grantham House, Mary said she would rather sleep on the roof than share with Edith.
Edith receives an offer to write a newspaper column from Gregson. Eventually an attraction develops between them, but Edith soon learns he is already married. She confronts him and insists on resigning, repulsed by a married man flirting with her. However, Gregson explains to her that his wife, whom he loved very much, has been in an asylum for years and no longer knows him. When she asks him why he has not divorced her, he explains he cannot because his wife cannot be deemed responsible in the eyes of the law simply because she is a lunatic; she is neither the guilty nor innocent party.After he professes how much it means to him to read her column and meet her, she stays on.
She meets him again in Scotland in September 1921 while holidaying there with her family at Duneagle Castle. Mary and Matthew then disagree over his motives for pursuing Edith. When Michael reveals he loves her she insists that she cannot see a happy ending with him. Nevertheless she does ask Matthew of his opinion of Michael after the two men had gone deer stalking, and defends Michael against Mary's cruelty towards him. While fly fishing, Michael confides in Matthew about his wife. Their conversation convinces Matthew of Gregson's deep love and honesty towards Edith, but he finds the prospect of Gregson's future liaison with Edith socially unacceptable. Matthew tells them that he will say nothing for now, but that if they pursue a relationship he cannot remain silent. He effectively instructs Gregson to put an end to his courtship and say good-bye to Edith. True to his word, Matthew does not tell anyone. Gregson does try to say goodbye to Edith, but she insists that it is not their last evening, that she is now absolutely sure that she loves him.
Edith and Michael kiss.
She reunites with him again in 1922 at King's Cross after the family's mourning period for Matthew's death. She not only continues writing for the Sketch, but she dines with Michael at the Criterion and later visits him at his flat. At a party there she meets many of his literary friends, including author Virginia Woolf.
When she learns of his plans to become a German citizen in order to divorce his wife and marry her, she is worried that people will hate him, citing that the royal family themselves had renounced their German heritage. Nevertheless he is undeterred, especially when she assures him she will love him more than ever. She then asks Michael to come to Downton and get to know her family even more. Then she returns to Downton again, but admitting "it is getting harder to say no" - meaning to stay the night with him. She eventually does stay the night with him, creeping back into her Aunt Rosamund's house in the early hours of the morning. She is seen by a servant who tells Rosamund. Rosamud then confronts her, warning her to be careful but promises she will not tell anyone.
After Michael leaves for Germany, Edith doesn't hear from him again. She soon learns no one else knows where he is, with both his office and the police looking for him. She worries for his safety, but wants to know the truth. Later she admits to her father however when they may be close to learning the truth, as long as she does not know for certain the truth "in a way I'm keeping him alive. I hate to let go of that." She is in despair when she hears he has died. She inherits his publishing company, and raises their daughter.
Edith loves her daughter very deeply. After Michael disappeared following their one-night stand, Edith secretly went to a doctor in London, and later received confirmation that she was in the first trimester of pregnancy. Wishing not to be an outcast to her family and society, she decides that she will have an abortion even though she loves Michael and wants his child. After seeing a woman cry at the clinic however, she decides that she loves Michael enough to keep the child.
She visits the farm repeatedly to see her daughter, and is later distraught when Mrs Drewe keeps her away out of fear that she considers the child like a plaything. Edith proves her love for Marigold even more when she chooses her daughter over her family and reputation by reclaiming her and running away following news of Gregson's death and her aunt and grandmother's plans to take the child abroad again. But they later return as foster-mother and daughter, but Edith's affection for Marigold remains strong - even when going to London for Rose's wedding she feels guilt for leaving Marigold behind and thinks about her all the time.
Tom taught Edith to drive after the Great War began. When Tom became engaged to her younger sister, like her elder sister she tried to persuade Sybil to back out. But when Tom married Sybil she began to treat him with courtesy and respect. She was at his wedding, just as he was there when she was supposed to wed Anthony Strallan. She, like Tom (and the rest of the family), mourned deeply when Sybil and their brother-in-law Matthew passed.
Tom defends Edith from Mary's teasing in 1922 when Rosamund takes her to the continent (not knowing Edith was pregnant with Michael Gregson's child). By 1923 they appear to have grown much closer. At the ball at Grantham House, Tom speaks to Edith, where he clearly thinks of himself and her as the rebels in the family. He tells her they need to stand up to them, that however much they love them they must fight their corner or be defeated by the rest of the family. Edith is inspired by his words to go back to the continent and reclaim her daughter. She tells Tom he is right, and thanks him (without telling him specifically why).
Before she leaves Downton, she tells Tom he is a fine man and that if she could talk to anyone about her situation it would be him, signifying how much she trusts him, and gives him a kiss on the cheek. He encourages her after she returns to get more involved in the running of the magazine business she has inherited, saying she is "clever, and a good writer". Edith tells him that while Mary talks like she is the only one who would miss him if he moves to America (which he had been considering strongly), she would miss him too. And he tells her he would miss her.
Edith becomes closer to Rosamund as she spends more time in London and stays at her house, 35 Belgrave Square. Edith is unhappy with Rosamund following her night with Michael Gregson, but when Edith becomes pregnant Rosamund is the first to know the secret (because Edith was in London with the intent of having an abortion, for fear of becoming a social outcast for having an illegitimate child).
Rosamund comforts Edith and pledges to support her, despite Edith's fears that Rosamund and the rest of the family will shun her. Though she advises against the abortion, Rosamund is with Edith when she goes before leaving. Rosamund proposes going to the continent and giving the child up for adoption so that Edith will be free.
Edith is not happy however with having giving her child up in Geneva, Switzerland. Rosamund on the other hand becomes cold again, insisting to Edith that she must move on and forget the child. Though she does feel for her when she grieves in fear for Michael, Rosamund insists that this is for the best. But Edith in the end chooses to reclaim her daughter and have her raised on a farm nearby (which Rosamund opposed).
Branson taught Edith to drive and as a result she offers her services to Longfield Farm to drive the tractor. Although first surprised by the offer, Mr and Mrs Drake soon accept. John Drake falls for Edith, tells her that she is beautiful, and she shares her first kiss with him. However, Mrs Drake sees them and Edith is later informed by letter that she is no longer needed on the farm, that they have found someone else to help.
When a severely burnt soldier, Patrick Gordon, arrives at Downton from Canada with claims to be Patrick Crawley, no one but Edith believes him. She spends lots of time with him reminiscing about their childhood and tries to convince the others that after the Titanic sunk he suffered from amnesia so they mistook him as Canadian, where he took his name from a bottle. It apparently wasnâ€™t until he was blasted in war that he completely remembered about Downton. Worried that Matthew Crawley would not be the future heir, Robert Crawley investigates the matter and finds out that one of Patrick Crawleyâ€™s friends, Peter Gordon, emigrated to Canada a year after the sinking of the Titanic. Shortly afterwards, the soldier says goodbye to Edith in a letter. She still believes he was her cousin, and the whole thing leaves her devastated.
Timothy Drewe is a tenant farmer on the Crawley estate and has a wife and several children. In the summer of 1923 Edith asks him to take in her daughter and raise her with his wife, saying that she will pay him whatever he wants. She tells him that the child is the daughter of a friend of hers whose parents are dead and that she cannot raise the child at Downton Abbey as her parents did not approve of the friendship. She urges him to keep it a secret. He says that it can be a secret just between the two of them. Timothy suggests that he will write a letter to himself saying that a friend of his has died and left this child alone so that even his own wife will not know the real origins of the child. Edith is deeply touched that Drewe would keep her secret for her, commenting on how good it is to know there are some decent people in the world.