[DonC]

UT:
Get her into professional therapy. No reflection on you but you aren't equipped or trained to handle this kind of thing once it gets to this point.
Unfortunately all you can do at this point is offer moral support and be there if she needs any outside assistance but again,,,,,,,,,,,,,,,, get a professional involved.
One of the hardest things an adult has to do is realize that all they can do is to set the best example they can for the young ones and hope it takes. Sometimes it does and sometimes it doesn't but there's no way they can be sure it will.
DonC