Background
She was born in Montreal and studied philosophy at the Cégep Édouard-Montpetit and theatre and film at the Université du Québec à Montréal and the Université Laval.
She was born in Montreal and studied philosophy at the Cégep Édouard-Montpetit and theatre and film at the Université du Québec à Montréal and the Université Laval.
From 1975 to 1979, she apprenticed as a mime at the Théâtre national du Mime du Québec.
In 1991, Vaillancourt became artistic director for the Théâtre de la Ville de Longueui. She also wrote for the publications Le Devoir, Jeu and Trois. She has been artist-in-residence at the Art Studio at the Banff Centre, at the Festival des francophonies en Limousin and at the Chartreuse de Villeneuve-lès-Avignon.
She has served as president of the Centre des auteurs dramatiques du Québec.