Born in Toronto, Ontario, in 1956, Hart made her professional debut with the RWB in 1976. In 1980, she was awarded the bronze medal at the World Ballet Concours in Japan, and the gold medal at the Varna International Ballet Competition where she also received the Exceptional Artistic Achievement Award. Both medals were awarded for her performance of Belong pas de deux, created by internationally acclaimed choreographer Norbert Vesak as part of his work What To Do Till the Messiah Comes.