My daughter was/is going through this. Whenever her hair gets oily with little salty looking dandruff, her skin gets very oily and she gets red pimples. A derm, an endocrinologist, and a pediatrician all said it was puberty. SHe has had blood work and it came back normal. SHe got breast buds at 9.5 and pubic hair earlier than that. She has been shaving up to the knee since spring. Maybe you can take her to the beauty salon and have the shampoo girl teach her how to wash her hair properly--sometimes kids pay more attention when someone other than mom tries to explain it to them lol! A lot of moms say that kids that age don't brush their hair or try to keep it styled nicely---wait until junior high--it's all about fashion.