In 2013, Miller appeared in Cycle 20 of the CW Network reality television show America's Next Top Model, in which she competed against fifteen other aspiring models. In the competition, Miller was one of the front-runners, having never placed below fifth after the first panel, where she was placed tenth. She was one of the strongest of her cycle, having won a total of three challenges and received six first call-outs. Also, Miller's photograph from the paint photoshoot was deemed by Tyra Banks as one of the best produced in the history of the show. In Week 8, Miller failed to book any shows during LA Style Fashion Week. At the final runway show in Bali, Miller faced difficulty when she accidentally stumbled with her stilettos on her gown. Despite this, the judges were still impressed by her walk. At the final deliberation, the judges noted Miller's command on the runway, her fluidity, as well as her high-fashion and girl-next-door appeal. She would eventually beat fellow competitor Marvin Cortes in the season finale, becoming the twentieth winner of America's Next Top Model.
Fox graduated from Monarch High School .  As of 2009, she was a sophomore student at University of Colorado at Boulder majoring in studio arts. She wanted to be an artist, journalist and model .