Dumais started playing for the Élites du Lac St-Louis. In 2004, her team took first place at the Jeux du Québec. She took the silver medal at the 2005 Canadian Championships. She was a two-year member of Dawson College in Montreal and was an assistant captain in 2008-09. She competed at Kuper Academy for two seasons and was a two-time Kuper Academy Academic Athlete of the Year. Dumais was a Montreal Canadiens scholarship holder in 2010 from the Quebec Foundation for Athletic Excellence.