Pitre auditioned in New York City for the musical "Napoleon" being produced in London, but was turned down for the role of Josephine. The director, Francesca Zambello, told her she was perfect for a show she was also casting in Toronto entitled "Mamma Mia!" Pitre auditioned for the role of Donna Sheridan. Although initially hesitant about the part, she accepted after seeing the show. She performed the role in Toronto and in its United States national tour, and after 18 months, was asked to play the role on Broadway.