she gets checked out properly, but Sinead later confesses this to Diane. Diane reveals the truth and social services take away baby Katy and place her into care. Diane then fosters baby Katy to keep her granddaughter close and warns Sinead to stay away. Diane and Tony then prepare to marry, but during the wedding, she is arrested for possession of drugs, which belong to Trevor Royle (Greg Wood). Diane returns from the police station to find Katy convulsing in her cot, and is attacked by Sinead in the street for not believing her. Sinead is arrested for assault and Diane rushes Katy to the hospital. Diane is then informed that baby Katy died and Finn reveals that he allowed Sinead to see Katy whilst Diane was in police custody, shortly before Katy was found convulsing. Diane is disgusted with Sinead and believes that she poisoned Katy to finally get attention. Diane bans Sinead from attending Katy's funeral, much to the horror of Sinead and Freddie. Freddie fights for Diane to allow Sinead to go, but Diane refuses and attends the funeral herself. Sinead then receives news of Katy's postmortem, which reveal she had an underlying heart condition and was not poisoned Sinead shows up at the funeral and publicly humiliates Diane and slaps her, before ordering everybody to leave the funeral so she can have time alone with Katy's coffin. Diane is desperate to make amends with Sinead and begs for forgiveness on several occasions, and eventually Sinead relents and forgives her. However, this is revealed to be fake and Sinead is secretly planning even worse revenge on Diane. Diane and Sinead discover Finn looking at a video that he filmed of him violently attacking Blessing Chambers (Modupe Adeyeye) because she was a transgender, and Sinead is adamant that they should hand Finn in, but Diane refuses and deletes the file, saving Finn and implicating Finn's innocent friend Robbie Roscoe (Charlie Wernham) in the process. Secretly, Sinead seduces Tony in order to get revenge on Diane for good for not believing her over Katy's death, but she ends up falling for Tony and the two embark on an affair in secret. Diane is horrified when John Paul then reveals that Finn raped him after Finn attempts to rape Nancy Osborne (Jessica Fox) - but firmly supports her son. Diane and Tony are subjected to a hate campaign from the