If she's truly mentally ill, which sounds like it's the case, you're going to have to think way outside the box. Appealing to an emotion would probably be the most effective thing. If she's afraid of spiders, put some fake ones on the front door. Sounds mean, I know, but what's worse, scaring her a little or having a mentally ill woman show up unannounced in your bathroom while you're in there showering? Besides, you get the idea. Make the place uninviting for her. Possibly get a door handle that automatically locks whenever the door is closed (don't ever forget your key, though).
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