Originally Posted by
reefbreakbda 
From what I’ve read it would be better if she believed that the family is already over and that the rehab is solely her shot at her own recovery rather than a desperate route for the addiction to prevail.
I'm sorry but I think that this is awful, awful advice. The more someone has to live well for the easier they will find it to get better. If, as far as you're concerned, your marriage might survive if she gets well, there is nothing wrong with her knowing that. If she thinks it's over one way or the other, her incentive to go through all of the hard work of getting better is minimised.
The important thing is that she knows that actually recovering is what's necessary, not just going to rehab. There is nothing wrong with being honest with her about what you need from your marriage and letting her decide if she can/will ever be able to provide that. (And vice versa.)