Is there any support from the school? I know our local high school has a mental health worker, obviously not for this level of need, but perhaps they could give some practical advice or support in the mean time, or from the college she is hoping to attend. I know some are working from home via phone/video call.
Have you checked out the books to buy from this website? The more knowledge you have the better to be able to help your daughter. There may be some resources for young people if you browse the website.
You are doing great and I hope the help you both need won't be too long in coming.