K.M.
I agree that what you are using on her hair now may also be the culprit. I use a tea tree oil shampoo but you must be aware of the ingredients of other shampoos out there since if they contain mineral oil or alcohol, they won't help the condition. Does she take vitamins? I good skin vitamin will help with that and I use a great one with CoQ10 and flaxseed oil. Products can cause reactions like this. How is the rest of her body's skin? Dry as well? How much liquid does she get in a day. Sometimes there is food allergies but I would definitely start the route of products and a good vitamin. Let me know if I can be of help to you and best of luck.
K.
Wellness Consultant