The role models are youbtube gamers, LouHotel. It is a male world. She games. Few girls do.
Having been a gamer and knowing what the community is like I would not let a 12 year old girl anywhere near it now.
Dh and I gamed a lot in our 20s and early 30s and it was incredible how adult it was. I always gamed under a male name to avoid the sexualised interactions and sexist attitudes and abuse. I was considerably older than most playing and was very aware of how other players gave you more respect it you were a guy. I did tell players I got to know and knew respected me in time and in fairness they understood why I did it.
Dh is very open minded and not much shocked him but what happened to 14 year olds in that community and how parents didn't know what was going on staggered even him. He often pulled up other players for their behaviour.
The real world is very different to the online world though. She shouldn't be doing 'they' because ultimately you can't escape your physical appearance in the real world and you are always going to be treated as female whether you like it or not at some point.
She sounds like she is blurring the boundaries between real life and the gaming world here as she's too immature to deal with that adult world.
There is no way in hell I'd let a daughter of mine near it now, without me fully aware of everything (I'd literally insist on playing with her).
There have been scandals reported in the press just this week about the sexism and sexual abuse in the gaming world.
Tread carefully. I've seen enough first hand that would shock most people. Sexual harassment of friends and stalking of them via friends, family and their workplace. Police involved in more than one incident.