Nbr but 6 year old brittle hair tips?

Reg 🇬🇧 👨‍👩‍👧‍👧🤰dd 23/1/19

My 6 year old girl has long hair but it’s so fine and breaks and knots so easy.

I shampoo only 1/2 a week and use condition on it, only comb with wide tooth comb etc but it’s still awful and dry.

Any tips for helping child’s hair get better condition xx