I’d be super skeptical to put chemicals and toxins right on her fragile and sensitive scalp. I think sometimes it can be an internal thing- gut health, sensitivity, or just build up of something in her body (sugar, dairy, soy, etc) I’d try a probiotic, extra water and eliminating some of those heavy hitters one at a time to see if there’s any difference! If it’s just dryness, I know blow drying right after a bath/shower helps. And a gentle shampoo and conditioner- Alaffia is a good brand (amazon or Whole Foods)