Steve-
Just so that you know, I have personally seen addicts "play" the rehab card.
I once heard one say "I went to rehab for you." For me? What?!? Not me, never for me. They're supposed to go for themselves. Anyway, they dangle it like a trophy to their codependents, in order to manipulate the codependents and keep them exactly where they want them. Steve, with all due respect, I believe that you are being played.
God has his hands in all things, and that when her time is right she will go. Not for you, not for her parents, not for anyone but herself, and she will go when she is ready and not one minute before.
The people that have the "God is my co-pilot" bumper stickers have gotten it all wrong. God is the pilot and we are along for the ride. So just relax, sit back and enjoy the ride, because God loves you and will take care of you. Please try to love yourself enough to let her go.