tryvia, I'd just add to what others have said here by putting my spin on it: BEHAVIORS, BEHAVIORS, BEHAVIORS. Watch them very, very closely. A's speak a good game, are very earnest in their belief they can quit, and then ....
I am speaking from my own personal experience here, being married to an A who has been in three inpatient and two outpatient alcohol rehab facilities. He'd work the program as long as he was in the facility, but left to his own devices, he'd be back to using within a month of being released.
I hope and pray your gf is sincere and gains recovery. Just watch to see if her actions match up with her words. Best of luck to both of you!