Botterill scored again two minutes into the final frame. Shewchuk scored on the power play at 10:41 of the third, and Botterill completed the hat trick six minutes later.
The Crimson outshot the Tigers, 28-19. Princeton Coach Jeff Kampersal pulled goaltender Sarah Ahlquist after Botterill's second goal, but the Tigers could not solve Harvard senior netminder Crystal Springer on the other end of the ice. Springer recorded 39 saves on the weekend.
Harvard will now prepare for St. Lawrence, which beat the Crimson in New York in November. But Botterill and Shewchuk did not play in that game, and Harvard is hoping its team chemistry has improved over the course of the season.
"For one thing, our forechecking is getting better," Catlin said. "We're becoming a more cohesive unit. Things are finally starting to come together for us."