Dandruff could be due to dry or oily skin ... it is a bit different to cradlecap I think as cradlecap is whole chunks of scalp lifting off? If it is dandruff, it's finding out which is her type - I have oily dandruff which means that drying the scalp helps .. with dry dandruff, making the scalp oily helps. Although, if she's scratching, it may be headlice I'd go to the pharmacy and have a chat with the pharmacist, they are pretty good at diagnoses.