Bless you Julie,
No one understand the love of a mother unless they are a mother themselves and even then we don’t really understand it until it is tested to the limit.
If you can talk to her tell her you love her and praise the smallest things she does which are positive at every opportunity. Seize any small glimmer of her communicating a desire to change – ‘I’m sick of feeling like this’ …. ‘ My life is sh1t’ etc.
Try not be preach but question and then she will question herself and that is positive.
If you are a praying person I would advise you to pray too – it will help you and bring about hope beyond that awful helplessness feeling. Otherwise keep a diary which you can share with her when needed, it might bring her a better sense of perspective and also help you see which direction things are going.
You sound like a most worried mother but one who is strong and actively seeking all the help she can. expect to be not sleeping, stressed and emotional – bravery doesn’t come without fear, so be kind to yourself, surround yourself with positive people and cancel as many stressors in your life which you can. Then you’ll be in a better place to help your daughter and stay sane! X