Toal begins performing at the Abbey Theatre in Dublin in 1946, when she is just sixteen years old. She becomes a fixture at the theatre, portraying Bessie Burgess in Seán O’Casey‘s The Plough and the Stars and the Widow Quinn in John Millington Synge‘s The Playboy of the Western World. She also appears in several one woman shows, including Baglady, which is written by Irish playwright Frank McGuinness.
Another playwright, John B. Keane, writes the role of Mame Fadden in his play, The Change in Mame Fadden, specifically for Toal. Hugh Leonard also pens characters in his plays A life and Great Big Blonde with the intention of casting Toal in the parts. She is best known to Irish television audiences for her role as Teasy McDaid on RTÉ One‘s Glenroe during the 1990s.
In 1952, Toal marries fellow Irish actor Milo O’Shea. They divorce in 1974.
Toal dies in her sleep at her home in Sandycove, Dublin, on August 24, 2012, two weeks before her 82nd birthday. She is survived by her sons, Steven and Colm O’Shea, two sisters, one brother, and three grandchildren.