You can send a letter demanding withdrawal and the reasons therefor.

You should continue to try to find an attorney. You can try to handle your case yourself, but it is very difficult.

Hire an attorney who is expert in mold cases. Use the Avvo search tool to find an attorney. https://www.avvo.com/find-a-lawyer

You can advise the police, and any other authorities of the true facts.

See if you can work with your insurer to provide all the information they need to consider the claim and pay it.

You can force, upon proof of the purchase, her to sign another document. You could sue but would be much easier to try to convince her to do it.

It is up to you to show the judge the truth.

He is responsible for the damage he caused. It will be a matter of you to prove that he did the damage.

You do not have to agree to his terms, but you should decide if that is the best route or not.

If everyone agrees, yes. Otherwise, there may need to be a lawsuit to determine everyone's rights and responsibilities.