S.H.
My daughter is 9.
I get the Garnier Fructis brand, leave in conditioner, for her.
It makes the hair conditioned, does not have a sticky/oily feel, makes the hair shiny and less tangles.
This brand has good products.
You can get it from any drugstore or grocery store.
Also, when drying her hair, don't RUB , just blot with a towel.
Also, keep her hair regularly trimmed, to get rid of split ends. Split ends make the hair appear drier.
Also, she does not have to wash her hair everyday. That makes the hair dry out.