let me tell you a secret about managed properties - you never get your deposit back. they claim it for wear and tear, etc. even if you stayed to the term of the lease, you wouldn't get the deposit back. my hubby got his back because the apartment he was living in had major AC problems and the office knew he could have terminated on breach of contract. they gave it to him to be nice. otherwise, every where else we have rented - they kept the deposit regardless of the extent we went to for cleaning, etc - even when we met the terms of the lease.
if you and she have agreed to ending the lease early, then i would suggest that you write something up that covers what you agreed to, you sign it, have hubby sign it, and have the lady you made the agreement with sign it. there should bea notary on site. have it notarized and then you have something in writing that proves there was an agreement about early termination. with the notarized signatures, it's a legal document. make sure that her signature is notarized as well as your's and hubby's. otherwise, it doesn't help. also be sure to include her job title (manager, etc.)
as for the deposit - kiss it goodbye and move on.
i had to do the same thing when i lived in an apartment buidling in Riverview, and i got stuck for a lot more because a class action suite about the legality of early termination fees had not been settled. when that suit was settled, i got back about $300 of the $1300 i had to pay out.
cut your losses and move on. you won't get the deposit back - even if you had professional cleaners come in and the place was immaculent.