Linehan has appeared in many comedy revues written by her husband Fergus. She has appeared onstage in, among other plays, Blithe Spirit, House of Bernarda Alba and Twelfth Night. She is nominated for Best Featured Actress in a Play for her role as Kate in Brian Friel‘s Dancing at Lughnasa at the 1992 Tony Awards. She stars as Winnie in Samuel Beckett‘s Happy Days on stage and on screen as part of the Beckett on Film project, having already played the role in a 1996 production at the Gate Theatre opposite Barry McGovern.
In film, Linehan appears as Nurse Callan in Ulysses, May Dedalus in A Portrait of the Artist as a Young Man (1977), Aunt Fitzeustace in Fools of Fortune, Mrs. Canning in The Butcher Boy, Peggy Owens in About Adam, Mrs. Matson in The Hi-Lo Country and Millie O’Dowd in The Matchmaker. In television, she is a voice artist on the Irish language children’s TV series Inis Cúil in 2005, and appears in Hugh Leonard‘s BBC sitcom Me Mammy. More recently, she plays Deirdre O Kane’s mother in Bitter Sweet.