The RedHawks (2-2-0) scored what proved to be the only goal they would need just 3:56 into the match when Brittany Houghton found the left corner of the net off a feed from Brittany Kinmond.
The lead grew to 2-0 with 3:38 left in the opening half when Dominick scored on an 18-yard shot from the top of the box, via an assist from Briana Tata. She found the net a second time at the 74:23 mark of the contest, with Sell and Tata earning assists on the play.
Sell scored an unassisted marker at 81:25 to set the final score.
Roberts Wesleyan outshot the RedStorm, 15-1.
Junior Hannah Stickelman (Ontario, OH) went the distance in goal for Rio Grande and had a pair of saves in a losing cause.
Rio closes out play in the Classic on Saturday against Daemen College. Kickoff is set for 5 p.m.