Nine fouls, several lost rebounds and bad passes made the game less than airtight for the Crimson.
"We let up too much in intensity," Delaney Smith said. "We let them get too close."
The closest Dartmouth got in the second half was within eight points on a 7-0 run, with 2:35 left to play in the game.
But Erin Maher, who had been quiet for much of the game, nailed a trio of treys to clinch the victory for the Crimson.
Relaxed Atmosphere
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After the game, Maher commented on the very relaxed atmosphere at courtside.
"One of our goals tonight was to play to have fun," Maher said. "We wanted to play with chemistry and euphoria. We wanted to get it together for next year."