Duluth scored the next two goals as Rooth and junior forward Hanne Sikio found the net to push the Bulldog advantage to 3-1 just over eight minutes into the game.
Crimson freshman forward Sarah Holbrook scored two minutes later to bring Harvard within one, but the Bulldogs regained a two-goal lead with seven minutes remaining in the first period on a goal by defenseman Tricia Guest.
The Crimson again got within one goal at seven minutes of the second period when Catlin scored, but the Bulldogs responded just six seconds later on a goal by Larissa Luther that gave UMD a 5-3 lead.
Four minutes later, Ingram tipped home a shot from the point by Hagerman on the power play before Rooth took the puck the length of the ice. Rooth found the net to give UMD a 6-4 lead after two periods.
Against UMD Kuusisto made 25 saves in net, and Ingram, Corriero, Hagerman and Van Reesema each picked up two points on offense.
The Crimson, now on a three-game losing skid, returns to action on Friday when it hosts nationally-ranked ECAC opponent Brown at 2 p.m. at the Bright Hockey Center.