I would say, in conventional thinking, no, she is not. Why do I say that?
I am a gamer. I play games every day of my life. I study Games and Interactive Entertainment at university (major in design, minor in programming). But do I consider myself a "hardcore" gamer? Not really. And it's not just because I loathe the term.
It's because I've never been in a clan. I've never played game after game of CounterStrike (I've always found the game to be quite dull). I've never kicked ass at Call of Duty. I don't even like Halo. I usually play single player. I don't like to immerse myself in the underbelly of gamer culture that is XBL. Even when playing MMOs, I tend to be solitary. I never have any desire to get the best kill:death, or phat lewtz, or whatever. I hate online pissing contests even more than I do irl.
I think it's that e-peen-free attitude that keeps me from being "hardcore". I have no problem with that. I play games for entirely different reasons.