That's awful.
I know it's a bit of a clichΓ© to say, but mental illness is horrible to go through for both the 'victim' and family.
You have every right to offload; this section of the forum is quite chilled with regards to mental challenges (see the Depression thread as an example) and has very understanding fellow members who won't judge you for stating what you're going through with your daughter.
If you feel more comfortable PM'ing someone you can trust regarding your daughter, by all means do so - plenty of genuine people on here would give an emphatic ear to your family situation.