At Harrington, the Eagles trailed by six points after three quarters, but outscored the Knights 17-7 in the final period to earn the victory.
Mary Prescott paced George Stevens Academy of Blue Hill with 16 points and Maddie Gray scored 15.
Anna Ramsay led Narraguagus with 15 points, while Kellie Kennedy contributed 14 points and Lauren Ramsay netted nine.
George Stevens 11 21 32 49
Narraguagus 13 23 38 45