Hi Hoffy,
Welcome to the Forum.
I think your daughters GP needs to be revisited, I understand the concern for the Children, but your Daughter was also reaching out for help which probably took her a lot to do.
Would she consider going to AA meetings or go on line and do them? She might find them really useful and also be able to talk to people in the same situation.
I think she is probably angry because she knows she has a problem and doesn’t know what to do, it is very hard for them.
My Son is an addict alcohol and cocaine, and I’m afraid they have to want to get better and try recovery.
There are people that you can talk to yourself if you look on line. I hope you and your Daughter find some help.
Keep in touch on here and take care.
Dx