Wow.  How sad.  Not sure how quickly the lady in the story went downhill to the point of thinking she was being chased?  If that was a sudden thing, and the step dad never saw troubled behavior leading up to it, I can't blame him 'cause maybe he simply didn't know exactly how bad it was?  It's tough for a mentally healthy person relate to one who isn't and what they're actually going through.  My ex went through post partum depression, and it took me a week to understand how bad it was affecting her, even though we were going to docs already.