Foster held Brown to a narrow 2-0 lead until the midway through the third period when the Bears opened the flood-gates on a powerplay goal from Tamra Jones.
The Bears exploded for three goals in the third, outshooting Niagara 16-1 in the final period.
Ali Brewer recorded her seventh shutout of the season for the Bears, denying Niagara goals on several occassions in the second period where the Bears were outshot 9-8.
Brown will host Northeastern in the ECAC semi-finals this coming Saturday.
Northeastern 4, New Hampshire 3
Northeastern held on to an early lead to upset New Hampshire on the road with a 4-3 victory in the ECAC quarterfinals.
Just 1:50 into the game, Northeastern's Colleen Coen opened the scoring to give the Huskies an early 1-0 lead.
New Hampshire would tie the game 1-1 early in the second on a shorthanded goal from Melissa McKenzi, but Northeastern would respond.
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