Christofferson, scoring in double figures for the 64th time her career, led all scorers with 18 points on 6-of-11 shooting. Johnson added 17 points on 5 of 11 from the floor.
Jadda Buckley’s 3-pointer extended the Cyclones’ NCAA record streak of games with a 3-point basket to 587. Nicole Blaskowsky came off the bench to hit four 3-pointers to finish with 12 points.
Auburn (4-3) stayed close, trailing by one, 33-32 at halftime. Hasina Muhammad led the Tigers with 15 points, with Tyrese Tanner and Brandy Montgomery adding 11 and 10 points, respectively.
Iowa State (6-0) remained unbeaten by sweeping both games in Las Vegas. The Cyclones rolled over Eastern Washington, 88-60, Friday night.