I'm sorry for your loss. That sucks.
What I'd do is hire a private investigator to get hidden videotape of her doing these things and then sue her or have her arrested. A psycho like this does NOT need to be free to do as she pleases. I mean, even if someone buys her house and get her out of your hair, she'll just move near someone else and become their problem. People like that are a danger to society.
