I suggest you follow up on the Al-anon meetings where you'll meet people who've experienced dealing with an A. Concentrate on yourself, because you've been through the mill just as much as she has. If you can, see a therapist so you can vent; makes a big difference.
It might help to give your marriage and relationship 12 months before you assess where you go next. This will help you avoid high expectations during the early months. I found this very effective in giving up drinking because my mindset was on a future goal.
Many relationships go through a rough patch after rehab, especially if the a comes home determined to make it work. Maybe come up with some strategies for dealing with hostility or difficult behaviour. You don't have to engage, but also don't have to become a doormat.
It's promising that she's ready and willing to go to rehab. Best wishes to you both.