Auburn trailed 28-23 at halftime, but Smalley nailed two threes to change the momentum after intermission and scored Auburn's first nine points of the second half to put the Tigers on top 32-30. Coach Nell Fortner's team led the rest of the way.
"She hit some big shots and was 5-5 (on three-point field goal attempts)," Fortner said of Smalley. "That is pretty remarkable.
"We competed so hard in the second half," Fortner added. "It is not easy playing on the road. We had foul problems. Trevesha (Jackson) and KeKe (Carrier) got that early foul trouble. I thought Chantel Hilliard gave us some big minutes."
Auburn built the lead into double figures midway through the second period on a fastbreak basket by senior Sherell Hobbs to make the score 48-38. The Tigers extended the margin to as many as 18 points before coasting home with the victory.
Fortner said a switch to man-to-man defense not only helped make the Tigers more aggressive on defense, it helped spark the team offensively.
In the second half the Tigers shot 62.6 percent from the field to aid their comeback. For the game Auburn hit 49.6 percent of its field goals while LSU made 36.4 percent.
DeWanna Bonner scored 18 points for the Tigers, who are ranked fourth and fifth nationally. She also added nine rebounds.
Fellow senior Whitney Boddie scored 14 points with nine assists and just two turnovers.
Kristen Morris led LSU with 14 points and seven rebounds. LSU fell to 11-8 overall and 4-3 in the SEC.
Auburn hit 5-6 threes to 2-11 for LSU, which really struggled at the foul line making just 9-22. Auburn made 11-16 free throws.
Each team had 36 rebounds. Auburn turned the ball over 17 times, five more than LSU.