[stomachmonkey]

She's obviously not all there.

You can't reason with or fight that.

Let her tend her piece of grass.

Stick up a camera.

If she vandalizes your property then call the cops, beyond that, ignore her.

If she tries to engage in dialog just tell her nicely "sorry, no time right now, Have a nice day" and walk away.

The more you let her drag you to her place the darker and deeper it will get.