[Too Many Projects]

Require she provide a document from a Dr. prescribing she needs a support animal. Anyone can make up that stuff and if you don't question it, they get away with it.
Along with the damage deposits already mentioned, requesting proof is also reasonable, I sure as hell would.
Also, when her lease expires, don't renew it. Claim the apartment now needs renovation and it will take many months along with a significant raise in rent when it's done, and she needs to find different, permanent, housing.