The Rebels, 17-13, fell behind 10-0 until Bianca Thomas nailed a 3-pointer with 14:20 to go in the first half. Thomas wound up with five treys in the opening half.
A Kayla Melson 16-footer gave Ole Miss its first lead of the game at 15-14 with 7:53 to go in the opening stanza. The Rebels led 30-28 at halftime.
Ole Miss expanded its lead to eight points at 48-40 and appeared to be in total control. But the Gamecocks went on a 9-0 over five minutes to take a 49-48 advantage. A Shantell Black two-point basket ended the Rebel drought and gave Ole Miss a 50-49 edge.
The two teams battled the rest of the way with neither gaining much of an advantage. Thomas missed a 3-pointer with 20 seconds left, but Black got the rebound, put it back in and was fouled. Her made free throw made it 64-63 UM with 16 seconds to go.
USC, 14-15, came downcourt and missed a 3-point shot that was rebounded by LaKendra Phillips of Ole Miss. She was fouled but missed the front end of a 1 and 1. When South Carolina rebounded, there was 1.5 seconds to go.
A half-court heave was batted away, and the Rebels moved on to Friday. They'll battle top-seeded Tennessee at 11 a.m. CT.
Ole Miss assistant coach Marlene Stollings said it took some time to get going, but the Rebels hung in there until they did.
"We got some good looks early, we just didn't knocked them down," she said. "We made some adjustments and things began to fall for us."
Thomas led the Rebels with 22 points. Robertson had 19.
Ole Miss lost 61-58 to Tennessee in Oxford earlier this season on a last-second 3-pointer.
"We feel very confident playing them," Stollings said of the Tennessee matchup. "They have a lot of weapons. We can't let their role players beat us. That's a focus for us. We like our matchup with them. On a neutral floor, we feel even better."
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