At Readfield, Logan Blood redirected a Katrina Lapham hit from the top of the circle and scored with 7:14 left in the first half to give the Lions the eventual game-winner.
The contest was called with 20:16 remaining because of rain.
Maddy Cummings scored the first goal for Belfast (11-1) with 15:44 elapsed in the opening half. Julia Ward made five saves on six shots.
Lindsay Jackson scored unassisted for Maranacook (2-8-1) with 27:12 left in the game. Amber Ridlon made 12 saves on 14 shots.