Green Ridge, coming off a second-place finish in the Otterville Classic, led 12-11 after the first quarter, 30-14 at the half and 45-23 after three quarters.
Green Ridge improved to 10-3 on the season.
Jessi Zimmerman led Northwest with 13 points and made four steals. Lakota Wiskur had nine points and 11 rebounds. Kendall Walk scored eight points and Paige Norfleet scored six and pulled down seven rebounds.
No Green Ridge stats were reported.