Lieber, coming off the bench, set a career high with her four goal total.
"B.U. was more aggressive and out-hustled us," Harper said. "They capitalized on our mistakes."
Freshman attackers Erin Kutner and Lizzy Frisbie scored twice for Harvard.
Captain Claudio Asano also tallied two goals for the Crimson in her third game back after co-captaining the Women's hockey team to its AWCHA national championship.
Already, the senior defender has made her presence felt. Asano now has seven goals in just three games, including a hat trick in a 10-9 loss to Yale.
"[Asano's] playing real well for us," Harper said. "She has the hardest shot on the team."
Junior midfielder Kim Weeks picked up the other goal for the Crimson, while a beleaguered Donelan made nine saves in a losing effort.
In addition to Leiber's four tallies, Cooney and freshman Ericka Hergendroeder both bagged hat tricks and an assist.
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