Weird puberty question

I have a 16 year old that’s gotten her period for 3 years now.

The odd part is, she has no armpit hair. I’m not certain of other body hair but she doesn’t shave her legs and the hair she has is barely noticeable. I’ll encourage her to bring it up at her next dr appt (she goes in alone at this age) but are there any women on here that don’t have pit hair and totally normal hormone levels?

Tia