Sleith was dominant in the circle for the Colonials as she compiled a 1.21 ERA over 17.1 innings. The senior threw a five-inning shutout in the season opener against Toledo while posting 10 strikeouts. Later in the day, Sleith earned the save against Niagara with the tying and winning runs on base in the bottom of the seventh, Sleith finished the Purple Eagles off with a strikeout to save the 3-1 Colonial victory. Not many batters left the batter's box as Sleith posted a 13.7 strikeouts per seven innings pitched (34 in 17.1) while allowing opponents to hit only .150 against her. In the final game of the weekend against Bowling Green, she threw her second complete game, striking out 14, which tied her career-high and was the 16th double-figure strikeout effort of her career.