Okay, so the trick here is to evade her attacks, and the monsters that she spawns.
Her giant foot will come down every now and again, trying to stomp you to death. If you manage to stay close to any of the fat sticking out of the doors, she’ll stomp on herself, doing half her health in one go.
It’s actually one of the easier boss fights in the game. And yes, I know, there are different Mom fights out there too.
