Mama does this sometimes. Honestly, if she's healthy, she could go up to 2 months or more without food. It could be that she just doesn't feel like eating. My snakes go off food around this time, and again closer to winter and sometimes in spring.

Also, stay VERY clear of dark brown slugs, they put a yellow/orange thick slime that will suffocate the snake if they bite onto it. It happened to Ember, and I don't want it to happen to anyone else's snake. I had to pull the huge glob out of his mouth