Deirdre is the mother of Graham Foster, who attends his rape trial in November 2004. When Deirdre speaks to Little Mo Mitchell about her son Freddie Slater, she reveals that Graham has two daughters from his failed marriage who he never sees. Kate Mitchell passes this information onto Mo's legal team, who ask Graham about it under cross examination. Graham lies and is caught out, then berates his mother for telling Mo. Graham is then found guilty.
Little Mo feels sorry for Deirdre and keeps in contact with her until she and Freddie leave Walford in May 2006.