Here’s the problem. She’s a crap guest, so my opinion is that you need to warn other hosts by writing a review, whether she leaves you one or not.
We as hosts rely so much on guest reviews to determine whether to host or decline a particular guest. As a result, it really bothers me when I hear that a host chooses not to leave a bad review for a guest because they’re worried that the guest will write them a bad review in return. What happens then is some other poor host has the same bad experience, but the guest continues on her way without any consequences.
On the upside, hosts have the opportunity to respond to bad reviews, guests do not. If she does leave a mediocre or bad review, you can leave a factual response that will always accompany her review.
You will get lower reviews than you’re used to eventually. It’s only a matter of time. You can’t please everyone no matter how hard you try. In the meantime, please take the time to warn other hosts about this guest by writing a fair and factual review.