If you are one of those three, you never "take off" your clothes or makeup.
There's no real indication that she is part of any of those subcultures though. She could just be wearing what makes her happy and/or matches the aesthetic of her workplace without being part of a given subculture after all. Someone wearing dark clothes and nail polish and having piercings isn't automatically a goth after all. Just like wearing jeans with holes and baggy flannel shirts doesn't automatically make you grunge.
She wears clothing that matches the aesthetic of the music she listens to, isn't that part of the defining traits of a subculture? Subcultures aren't clubs, they're ultimately just categorizations of people with similar interests.. I do agree though that she isn't a goth or uhh "grunge" (i hate that word).
Depends if your definition of "subculture" is the same as the OP's in this opinion.
Seems they think that being part of a subculture involves following specific "rules" - those being you can't ever project an image of something else. Forgetting, of course, that some people just want to suppress their individuality at school and be "themselves" at home, and that's okay, actually.