I know that sounds scary but sometimes you have to be cruel to kind. If you have her families support then i think you should seriously consider.
All in the name of leaving " no stone unturned". If she has a professional diagnosis, one way or the other, then you win. If there is a problem she will be in the right place for serious treatment and help and if she is kicked out as being of sound mind, then you know for sure your better out of the M for everyones sake.
If you think it is something you could do, then go for it. She aint going to like you for it , but does not sound like she likes you anyway. Nothing to lose.
