re: Complicated situation. Advice appreciated. Will try to be brief.

I would tell her that she doesn't have any implied permission to be out on your property by herself, and under NO circumstances should you give her that permission. Certainly not any permission to stay there for even a night.

I would make sure you have anything valuable locked up good. Sounds pretty damned suspicious the way she's acting, and where there's smoke, there's fire.

Now, if she wants someone to talk to, by all means help her out with some advice. But if she asks for other shite I would be very very cautious with what you offer.