Most of what has been said is true. People do have relapses, but some overcome it all together. You, my friend, are playing a huge roll in how her life plays out(not to put pressure on you, but just know what you're getting into)
You, sir, have to find a way to comfort her and make her feel at home, introduce her to a "new life" so to speak with new friends and all and help keep her mind off everything. You get to be the person who comforts her without misleading her into thinking more. It's sketchy but it can be done.
As far as going out to the bars and whatnot, get her reaction on it. If she doesnt want to, encourage her to stay at home. After a few months, it wont be bad for her to go out and have a few drinks, to relax, or even to do so in the privacy of your home, just make her understand there is a limit and it cannot be crossed, you know?
And the workout thing is good too, like they said occupying her mind is a great thing. Speaking of which, I'm a recovering food addict, anyone help me get on a work out routine?
Best of luck to you, I'm always around so if you want a few ideas feel free to PM me any questions and I'll give you an answer best I know how, but dont make your decisions based on one person on the forum, you know this girl best and you mroe than likely know whats best for her more than any of us, so remember that.