Born in Winnipeg and raised in Vancouver, Walsh always knew she wanted to act. "I didn't want to look back and wonder, 'what if?'" She earned her Bachelor of Fine Arts at the University of Alberta and quickly moved into theatre. Classically trained, Walsh has appeared on stage across Canada and in the US in such classics as Death of a Salesman, Diaries of Adam and Eve, King Lear, Henry IV and Much Ado About Nothing, for which she won a Dramalogue Award - Best Actress for her portrayal of Beatrice.

Her film highlights include Star Trek VII: Generations, Crossing Fields, Limbic Region, Deadly Wake, Soft Deceit, The Crush, and The Portrait.