NOTRE DAME, Ind. – The Saint Mary’s softball team swept a doubleheader against visiting Wheaton on Wednesday by 4-0 and 7-6 scores. The Belles retired the Thunder in order in the first inning and struck in the bottom half of the frame. Mary Charniak drew a lead-off walk and stole second, and Caitlin Traxler laced a double to the warning track two batters later to drive in Charniak. Saint Mary’s forced Wheaton into stranding a runner on second in their next at-bats, and the Belles added to their lead in the bottom of the second. Libby Bierbaum drew a walk,…