Hasenfus played four years of ice hockey and two years each of field hockey, swimming & diving, and lacrosse at Needham High School. She was part of the 2017 swimming & diving team that received the MIAA Sportsmanship Award.
Hasenfus was born in Boston, Mass. She is the oldest child of Laura and Richard Hasenfus. She has a younger brother named Timmy. She is majoring in nursing.