McDavitt and Gannon gave Maasdorp an opportunity on a penalty corner and she capitalized, flipping a shot past Northwestern keeper Sherri-Anne Nyberg at 60:24.
Harvard then got its game-winner with under four minutes left on the clock. Maasdorp collected a rebound and scooted it across the box inside the far left post, marking the first time this year the Wildcats have surrendered a second half lead.
Remtilla made two saves, and junior forward Beth Sackovich also contributed two saves defensively in preservation of the victory.
The Crimson now looks forward to Wednesday night when it hosts No. 10 Northeastern on Jordan Field at 7 p.m.
—Staff writer J. Patrick Coyne can be reached at coyne@fas.harvard.edu.
—Staff writer Pablo S. Torre can be reached at torre@fas.harvard.edu.