Sullivan was born to Michael and Gayle Sullivan and has three siblings, Bridgette, Jimmy, and Mikey. She is a graduate of Lake Forest High School and is a sophomore at Ripon College. She also trains in mixed martial arts with her boyfriend. She was known for appearing at the Bristol Renaissance Faire, which inspired her medieval fashion sense. Sullivan got into modeling when she tried out for Elite Model Look following a sports injury and won the regional division of the competition. Sullivan attended Ripon College and majored in government and chemical biology.