In the 1980s, St. Louis competed for the Ferland Quatre Glaces (first based out of Brossard, and then Repentigny) team in the League Régionale du Hockey au Féminin in the province of Québec. She participated in the 1987 Women's World Hockey Tournament and was Canada's leading scorer. St. Louis was a member of the Canadian Hockey Team from 1990 to 1999. She was part of the first five women's teams to win gold at the IIHF Women's World Championships. She won the gold medal at the 1996 Three-Nation Cup and the gold medal at the 1996 Pacific Rim. She was also an assistant coach for Team Quebec at the 1991 Canada Winter Games. France St. Louis was the Most Valuable Player of the 1998 Esso Nationals as Team Quebec finished in third place and was awarded the Maureen McTeer Trophy.