She played hockey at prep school and was the captain of the Rice Knights. As a senior, she accumulated 38 points (21 goals and 17 assists). DiMasi also played three years with the Connecticut Polar Bears. She competed with the Polar Bears at the USA Under-16 National Championships in 2007 and 2008. In both years, the Polar Bears finished second.
She scored 40 points (25 goals, 15 assists) last season with the Cambridge Fury. She also played four years with the Stratford Aces and was team captain in 2006-07. She was team MVP in 2005 and 2007. She was an assistant captain in 2009 with Team Ontario and led the squad to a silver medal at the nationals.
Played the last two years with the Chicago Mission. Took part in the USA Hockey development camp from 2006-09. Santostefano attended New Trier High School and played varsity golf for four years. In addition, she played three years of varsity softball.
St. Martin played against Northeastern in 2009-10 with Dawson College on September 26, 2009. St. Martin played two seasons with the Dawson College Blues. Prior to Dawson College, she played three seasons with the Deux-Rives boys hockey club.