The Davidsonville native attended South River High School and as a prep performer she made the 2002 first-team All-State, All-Region and All-South accolades. She finished her prep career with 24 goals and 28 assists. Fontaine was also a member of the Crofton United club team.
She holds an Advanced National Diploma from the NSCAA and is an Assistant Director of Coaching at the Piedmont Triad Football Club.
Fontaine married her husband, Keith, in the summer of 2008. They have a son, Kaden, born in 2012. Brandi's twin sister, Jacque Sutphin, also played at Francis Marion U.