So what would you do?

[VarryOn]

1. You are a very patient landlord...

She can walk all over you only if you allow her to. It sounds like you've gone well beyond what any tenant should expect (e.g. letting her live free or at a discount, helping take care of her pets, listening to her cats, etc.). And she sounds like a total ingrate. Ungratefullness is one of the most ugly traits a person can show.

With five cats and a dog living indoors, I'm sure the place is quite pleasant selling.

I'd give her a verbal warning. If nothing changed, I'd give her something in writing, and next I'd evict her, following local laws and the lease you had her signed.

Good tenants are a God-send, and bad ones like this are of the devil!