hackmum - I get where you are coming from. There was a girl on my gymnastics team whose mum wouldn't let her shave; she was very slim and blonde and always tanned, and to my mind her delicate blonde leg hairs looked really nice, natural and girlish.
But I was not allowed to groom myself in many ways that most people would consider normal when I was a child. I wasn't allowed to wear a swimsuit with a top on until I had breasts - I wasn't allowed anything other than a bowl cut till mid-primary school - I wasn't allowed to shave or pierce my ears or anything.
My dad in particular really fetishized the 'natural' look (not suggesting you are!).
As a result I felt dreadfully uncomfortable in my own body for years and, if I'm honest, still do. I always feel I am less put together than other women and a bit oafish/ unattractive/ icky somehow.
I understand that that is cultural indoctrination. But it doesn't make it any less real as a feeling. Although not directly connected, it is part of what led to my eating disorder as a student, which was very much about controlling and disciplining my body into an 'ideal' image.
I think letting a girl experiment with 'fitting in' and seeing what that is like may give her the courage to experiment with doing her own thing later. But preventing her from following her instincts may just make her feel like a pariah.