She is really lucky to have a friend like you. A person who really does care. It would be an awful situation to be in. But you need to tell her that its too painful for you to watch.

I know what it is to SI and I have also stopped. She needs professional help and she needs to be the one to ask for it. Each person is responsible for the choices they make in their own life. I think of my own alcoholic brother. I would dearly love to make him stop binging, but I can't. Last time he nearly died.

Of course you wont stop caring for her and you are as near as the phone is. Never stop caring. Sometimes we just need to step back.