From what I've gathered from the posts you've made, it can be summed up with something like this -
'This girl isn't living life the way I feel she should any more, and thus it's bad. Please help me stop her from living her own life and come back to living life how I say it should be lived.'
Forgive me if I'm way off the mark there, but that's what it seems to me.
However, I'm willing to be it's just a case of very bad wording and not getting your real point across which I'm guessing is this -
'This girl used to be really close to me, now she's become a recluse and I'm really getting worried she's going to forever screw her life up and never be happy in the future and this isn't right.'
Anyway, I was a lot like you have described her to be. 12+ hours a day on Warcraft, never went out blah blah blah. Well, I barely went out anyway, but whatever. For some people like me, socialising on a game like Warcraft is FAR more enjoyable than doing it in real life. I generally just don't like people and the cruel things they can do with little to no reason.
I too found love on Warcraft once, and that lasted for over a year. Although we did only live a 30 minute drive from each other, so that's a bonus I guess.
But anyway, after being addicted for so long I finally had enough and just kinda...stopped being addicted. I've never understood addiction personally, I either do something or I don't.
So I cut my play hours down, got a job, met a new girl, had a baby, and now...well, still doing the baby part.
I still play Warcraft, quite a lot, but never does it come before reality to me now. Kid wants something? Log off and away I go to save the day as Super dad. And so on.
While I get you're worried, perhaps the best you can do is just be patient and hopes she does what I did and just decides to focus on real life, or maybe play with her to spend some time with her?
If all else fails, hope she plays PvP server, roll the opposite faction and gank her until she rage quits forever.