You say this has been ongoing? In that case as long as she is acting normally, not lethargic, eating fine, and activity level is normal then Monday is probably okay. But, of course, keep an eye on her over the weekend (why does this stuff have to happen on weekends? Never fails).
She could have a tooth problem (even if her molars look fine she could have issues with her back molars that you cannot see without a vet scope).
What kind of bunny is she? Is she a lop?
I definitely think it is extremely important that you call a rabbit-savvy vet though first thing Monday morning to make an appointment as you don’t want to let gi issues go on for too long.
And again, just make sure that over the weekend she is eating, pooping and acting normally, and if not, then you will need to get her to a vet.
Also, to help us help you, what does your bunny’s diet consist of. I know you offer hay, and she refuses it, but what are the quantities of pellets and greens.