DD is the most developed in her class. Her armpit hairs are very long and she does gym and swimming with them very visible. When I suggested I could teach her to shave she said that she didn't know anyone else her age who shaved so didn't want to.
How can I introduce shaving and at what age? She also has some quite pronounced buds but doesn't want to wear a crop top as again none of her friends do. She starts secondary school in September and I think she should be wearing some form of crop top then but unsure how to introduce the notion to her.