Willis enjoyed a successful college career at UCLA. In 2006 as a senior, Willis was named prior to the season by Nancy Lieberman of ESPN as the nation's best defender, named Honorable mention AP All American, selected Third Team All American selection by Women's Basketball News Service, named as a Pre Season Naismith Award Nominee, nominated for the Bayer Advantage Senior Class Award, was UCLA's All time 3point shot leader (second on All Time PAC10 list), ranked ninth on the All Time UCLA Scoring List, ranked fifth at UCLA in all time games played, ranked 13th on all time school rebounding list, ranked 10th in all time school scoring list, ranked 8th in all time school free throw percentage, ranked second in all time school steal list and listed as the first player in history to record three straight seasons with 100 or more steals.