I wouldn't say she's a geek or nerd for gaming. These terms express how one experiences something not what they experience. Also, if she's just playing COD and Twattlefield then it doesn't count :p
My school friends used to call me a geek. They always told me "how can u play this games? Is there nothing else to do? Thats not interesting at all... etc"
So what do u think? Now they are all playing mmo games. ))
I don't think there is anything bad in playing games. And i don't get it why some people think that if someone has a different interests he(she) is a geek. U can't expect everyone to be like u and to think the same way.