Maddie Gallagher got to play hero on Friday for Missouri, driving home the pair of runs the Tigers needed to advance to the SEC softball tournament championship game with a 2-1 win over LSU. And Gallagher delivered her second RBI in walkoff fashion in extra innings. After the squads were dead even at 1-1 following seven innings, LSU was held scoreless in the top of the 8th inning. And when a pair of runners got aboard — and then to second and third base on a wild pitch — with Gallagher up to bat, she knew her job was simple. She delivered with a deep fly ball for a game-winning sacrifice. “We …