My daughter suffers from what she thinks is dandruff--dry scalp---I'm not really sure how you know the difference. I'd say her hair is normal to oily--but not real oily--definitely not dry either. Is there anything she can be using on her hair to help? Her hair is very thick and wavy and she battles the frizz in the summertime. I just bought her "TreSemme'(for all hair types)Shampoo and Conditioner. " A post on here said it was great for the frizz. Is there anything else she could be doing for the dandruff or did I make a wrong choice?