Hi spacegirl,
Welcome to PC!
I hope you find the information and the support you may be seeking.
Please do jump in and make yourself at home.
I am sorry your sister is struggling.
It's tough to diagnose conditions. Many different conditions can look alike. It's safe to say something profound is going on with her. This must have a huge effect upon everyone in your family.
Thanks for being a caring sister!
I hope to see you around the forums.

WC