The Warriors are now 12-4-3 on the season.
The game was scoreless at halftime. Jessica Kinnucan scored the first Warrior goal four minutes into the second half to give WMC a 1-0 lead.
Alexys Riksen scored the next three goals as the Warriors iced the victory.
WMC outshot the Crusaders 22-13 in the contest.
WMC will face Calvin Christian on Wednesday night in the regional semifinals at Reeths-Puffer.