I want to know if this should be considered a drawback or if these things are something I can overlook, so that I can totally except that she is not the person she used to be. I guess I'm worried about her. Dear Worried, We all grow and change, and your girlfriend is not the same person she was. If she told you about her troubled past, that was done with trust that you'd be able to accept and forgive. Yes, full rehabilitation is possible.
Many people give up drugs, drinking and other abusive or anti-social activities.
They get into them when they're young, and then they recover. They can even turn out to be a better person. A person who's been through recovery has learned compassion, they've developed soul, they have depth. With you, on the other hand, these may be untested qualities. Since she's done nothing to make you doubt her rehabilitation, and you obviously care for her, it's time for the thoughtful part.