It's heartbreaking to read your post; I'm so sorry for your circumstances.
Welcome to SR.
We can't tell you what you want - how to save her.
You cannot save her; she has to save herself.
At best, you have already given her all the opportunities she needs to get the tools she would need and the network, for recovery. You cannot give her any more.
You can save yourself. You can express to her you love her and know she can change her life if she ever chooses. You can prepare yourself for the worst. Those are the things you can do.
There is a lot of support available here for you, and in face to face places such as Nar-Anon and Al-Anon meetings. I hope you will feel welcome at these places and begin your own journey of recovery.
Addiction is a ravaging disease, and leaves so much collateral damage.
CLMI