The Jacks wrapped up the league's record season championship, going 9-0 in the Southland action and extending their winning streak to 12 matches.
SFA came into Friday's match having shut out each of their previous Southland opponents, rolling up a 31-0 goal advantage in those eight outings.
But in the 30th minute, Mallory broke free and scored her seventh goal of the season and the 18th of her career. The sophomore now is tied with Yoanna Garcia as Sam Houston women's soccer's third all-time leading scorer. Garcia scored her 18 goals from 2004 to 2007.
Mallory's goal tied the contest at 1-1. Kylie Louw put SFA up 1-0 chipping in a cross from Becky Johnson in the 10th minute.
Laura Sadler pounded in the match-winner on a pass from Chelsea Raymond in the 37th minute.
Megan Wasiak scored on deflection of a shot by Raymond that bounced off a Bearkat defender for the final goal early in the second half.
Sam Houston ends the regular season with an 8-11-1 record and finishes the Southland race with a 4-5 league mark.
Thanks to a 1-0 loss by McNeese State to Northwestern State Friday night, Sam Houston earned its third consecutive Southland post-season tournament berth. The tournament will begin with first round play on Thursday night in Natchitoches, La.