My roommate's cat is a menace, but because they're being neglected... What should I do?

My roommate adopted a cat last year because she was lonely, and now she is no longer lonely due to finding a human partner. Her cat is alone most days and is eating my bread. I have told her i want nothing to do with her cat (Not out of hatred, but from allergies). When i speak to my roommate, she assures me that she will be spending more time with her, but the problem persists. I imagine if I (begrudgingly) started the process of rehoming her cat, she would be fine with it.

WHAT SHOULD I DO?