"Our coaches told us to move out, and cover all the shooters," Egelhoff said.
The Crimson defense held Williams to just 8-of-19 shooting and Vera Feldbusch, the team's second-leading scorer, to just 4-of-10.
With the victory, the Crimson got a big confidence boost for next Saturday's game against Northeastern and the Ivy League schedule beginning in January.
"Our coaches and everyone were really pleased with the way we played," Sarah Johnson said. "We know we can't take Northeastern lightly. We'll need to play like we did on Saturday."