Bugs issue. Crazy tenant?

[John C.]

Hello, We had a tenant move in to a unit in triplex in PA October 1st. She began complaining about fleas and that she didn't like the kitchen floor. I know this was a mistake but I have her $250 to replace the kitchen floor with those stick down tiles and to flea bomb the apartment. Got it in writing that she was aware of and responsible for fleas. Lease also says all pests are tenants responsibility. Oct 11 she claimed child taken to emergency room because of flea bites. I asked her in text did the doctor say it was fleas or some other type of bug. She says he said fleas. I got local reputable exterminator there immediately. He said it "wasn't that bad" and mitigated them with 45 warranty. A week later she says she and the kids are getting bitten again by fleas and bed bugs. I send him back. He says he didn't see any fleas and the tenant specifically told him she only saw "two". He did not see any bed bugs. The tenant is on methadone or something like that. She also claims people and animals are going in and out of her apartment. I'm the only one with a key and I changed the key in front of her just to be sure. She says her Tylenol is missing and stolen. She is threatening to sue me and keeps saying she will go to the magistrate to break the lease. I told her basically just leave and I won't enforce the lease. Now she wants her security and rent payment back. I'm sure even if I offered it back her next comment would be she needs it back before she moves out in order to get a new place. She is complaining about other issues such as a leaking roof and a hole in the basement where animals get in. I did not notice these things on move in inspection. When I send a worker to check it out she denies access. I even have in a text message from her that she heard worker knocking and was too busy cleaning to let him in. She keeps sending crazy any long contradictory text messages at 1am some day there are bugs. Some say their aren't bugs or she can't see them. I've asked for pictures of bugs she doesn't send them but does send pictures of suppsed but bites. She makes reference to bugs and dogs and cats sneaking into her prior apartment (several apartments ago not immediately prior) There is only one other occupied apartment in the building. They had a minor flea problem which was treated. They sent me pictures of three bed bugs which I immediately had treated with a spray. The exterminator is going back to their place Nov 2 to inspect for bed bugs. But he hasn't seen them anywhere in the building and I've asked him to look. Advice?