Naenae I don't think she is too young for waxing. I was a hairy kid (one eyebrow, moustache, even hair on the end of my NOSE!) and hated it.

Nair or bleaching cream will be too strong for her skin.

From my experience, if I had a daughter facing what yours is, I would get her straight to a salon and then pay for laser hair removal as soon as she could stand it. Yes, everyone has different hair thickness, people should not pick on others. But if it was my daughter I wouldn't hesitate. Ditto for underarm hair as soon as she's concerned.

If you do get her waxed, pay a bit more and go to a decent salon where they will use cool wax and be gentle with her. And get it done on a Friday night so she has 2 days before she has to got to school.

ETA: Although laser treatment is expensive, it is for life and the sooner you get it done the less the cost works out to be over a lifetime. I was waxing every 6 weeks from 14 to 35 yrs of age when I had laser treatment. I could have paid for it many times over....