In 1998, Kelly realises that she has romantic feelings for her stepbrother, Scott Windsor (Ben Freeman). After sleeping together, Kelly returns to Roy and they get engaged. Whilst planning their wedding, Kelly continues to see Scott but refuses to leave Roy so Scott exposes their affair but Kelly denies it. After they get married, Kelly and Roy have financial problems and become cleaners. When Kelly "borrows" jewellery from a client, Miss Curtis, and stages a dinner party at her house, the police are called. Wanting to protect Kelly, Roy accepts responsibility and is imprisoned. Whilst he is away, Kelly sleeps with Scott again after meeting him at a hotel and they admit their love for each other, sending Kelly into a deep depression. After writing letters to her family and admitting to the affair on tape, Kelly attempts suicide. She is saved but loses the baby she was carrying, unsure if the father was Scott or Roy. Scott burns the letters but Kelly confesses to Roy and decides to start a new life in London, bankrolled by Chris Tate. Although she and Roy have a brief reconciliation, they are unable to make their marriage work and he leaves for Ibiza without her. Feeling rejected again, Kelly tries seducing Viv's new fiancé, Bob Hope (Tony Audenshaw), but he tells Viv and this leads to a vicious fight between Viv and Kelly, also revealing Scott and Kelly's affair. With no friends or family willing to talk to her, Kelly leaves for London, with only her younger sister, Donna (now played by Verity Rushworth), sad to see her go.