mako-------it sounds like you have the concept of being powerless over her addiction locked down----intellectually, at least. And, you know about the value in letting go and letting God.
The thought that I have is that you may be in a grieving process. Especially so, if there is a romantic element in your relationship with her.
Perhaps this signals to you the possible impending loss of the relationship----? That would certainly trigger a grieving process---and the pain of such is almost indescribable in it's intensity.
Have you ever grieved the loss of a relationship before---or, even the possibility?
I may be on the wrong track---as you have not indicated the nature of your relationship. If so---just ignore me. In any case, I have empathy for your pain.
I am glad that you have reached out for help. that is always a good thing to do.