Ah, at least you've downgraded it back to "work". For awhile it was "managed" and I kept waiting for the day you were going to say "owned."
Geez, do I have to break out the paystubs?!
Yes, I managed a namco owned mall Arcade for 3yrs. No, Ive never owned one.
As for the MK comments.. Kids know the difference between pretend violence, and real violence. Watch some kids cartoons someday. Especially the older stuff like Tom & Jerry, and Roadrunner. Characters hit each other with frying pans, setting fire to each other, and much worse. And if you think thats bad, go back to the B/W cartoons, and it gets even more violent.
Kids get the most of their morals from watching their parents 'live'. If their parents are nice, polite, kind hearted... they will tend to be that kind of person (or grow into that kind of person).
But if the parent is violent, hits the kids often, screams and yells all the time..etc.. the kids usually repeat that behavior. If the parents lie often, are ruthless or cold, snooty, etc.. again, kids will pick up on these traits. It could take years for them to un-learn these things, "IF" they ever get to that point.
Media has some effect on people, but you cant think that seeing a killing on a tv screen, is going to produce people that want to, or actually go out and kill others.
Since girls are people too, maybe just ask her what her favorite games are.

Maybe they dont know their Favorites yet, but they should have the chance to decide for themselves, just like the boys. Far too many people try to 'make' girls like things, rather than letting them decide what they like. Then the girls tend to feel like they are not supposed to like certain things... like RC cars, video games..etc.