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The team has shown positive signs offensively as it tries to win three in a row for the first time this season.
Until Friday, no one put 21 points on Rosemount's defense all season. Maple Grove did it in less than two minutes of game action, and won 27-10.
The Gophers will go for the season sweep on Saturday in Mankato.
Cooley, a freshman forward, got the first and final goals for Minnesota in a 5-0 win on Friday night at Michigan State.
Minnesota was balanced, hitting .327 as middle blocker Carter Booth led the team with 11 kills. The Gophers held Southeastern Louisiana to .131 hitting and posted 11 blocks.