Seeing that you and I have similar problems, I will help you solve them.
First, did she promise to refund you two months' rent and deposit verbally? Oral agreement is also legally binding, as long as you can produce evidence to prove that she agreed, such as recording, SMS recording and so on.
Second, you can bluff her. If you don't refund the money and you have proof, you can send her a lawyer's letter to inform her. But notice that a lawyer's letter is probably in 400 yuan, and it has no legal benefit, only serves as a warning.
Third, there is really no choice but to sue her through civil litigation, but it is not recommended to waste time, money and energy.
Fourth, call 1 10 and ask the police uncle to help you. This is also useful.
Fifth, either you take the time to find someone to rent out your house, sublet it to him and take his money, but this is not cheating money, just transferring your lease right to others.
I hope you can get your money back and curse those renters for dying!