Cradle cap and itching

My 3 month old has cradle cap which keeps coming back despite everything we do. We have tried coconut oil, a cradle cap comb to brush out flakes, a special Mustela cradle cap shampoo, Aquaphor. Every time we do this it’ll go away for like a day and then comes back. It’s gotten to the point where it has spread a little on her forehead and will itch at night. The itching will keep her awake. What should we do??