Colorado (11-12, 1-11) hadn't beaten a conference opponent since March 1 in an opening-round game of the Pac-12 Conference tournament. The Lady Buffs beat Utah 66-56 before losing to then No. 6-ranked Oregon, 84-47, the following day.
The Lady Buffs appeared to take command with a 16-0 run that started with 74 seconds left in the third quarter and lasted until 6:27 remaining. Quinessa Caylao-Do scored the final seven points during the spurt for a 72-58 lead.
The Trojans (14-9, 4-8) responded when Aliyah Mazyck buried a 3 with 5:54 left and that triggered a 16-2 run and USC tied it at 74 with 88 seconds when Minyon Moore sank a pair of free throws. But Hollingshead made a pair of free throws, Minyon Moore missed a layup and Robinson followed with her 3.
Robinson finished with 16 points and Peanut Tuitele grabbed 11 rebounds.
Mariya Moore led the Trojans with 22 points and Minyon Moore scored 19.