People who constantly reminisce over their childhood?

I'm so very sorry to hear that.. I think you should have a talk with her doctor. Granted, there isn't a lot they could tell you, because of privacy laws, but you could give the doc a heads-up on the situation. The next time she goes in they could do some testing for her. Is your dad in the picture, could he say something to her? Or if she has a close sister or other relative? I think you're very sweet for caring about her. I'd start with her family doc, if you can. :)