Frequently appears in the films of director Atom Egoyan.
Gabrielle and her husband, Hrothgar Mathews, have a son, Liam.
Gained 15 pounds for her role in The Sweet Hereafter (1997).
Her grandfather wrote for the musical stage in England, and her father was a child actor there. Eventually Gabrielle returned to England herself to study acting.
In 2000, she added her voice to a Canadian Heritage Moment commercial for the Terrace massacre.
She has portrayed a large number of real-life characters, including Elizabeth I, Mary Stuart, and Hitler's favorite photographer, Leni Riefenstahl.