A.V.
Hi,
Adults can use hydrocortisone cream on their excema but I am not certain if it is safe to use on young children. I would take her to the doctor because the sooner you treat it, the less itchy for her and the sooner it will clear up. If you want to try something over the counter I would try something with Oatmeal like Aveno or Eucerin calming itch relief. Those are both found at drug stores. Good luck!