Imani McGee-Stafford added 15 points and Enemkpali chipped in 10 for Texas (21-10), which will go up against second-seeded and seventh-ranked West Virginia (28-3) in the semifinals on Sunday.
Oklahoma (18-14) held a seven-point advantage at the break—despite shooting 37.9 percent from the floor—after the Sooners knocked down eight 3-pointers in the first half. The Longhorns opened up the second half on a 12-2 run, however, to take the lead for good.
The Sooners, who shot 50 percent (8 of 16) from distance at the break, cooled off in the second half, finishing with 13 3-pointers on 33 attempts. Aaryn Ellenberg scored 21 points for Oklahoma and Sharane Campbell added 12.