It could easily be an allergy, maybe to soap or shampoo, but more likely food. Try to cut out wheat, dairy, nuts, corn and eggs for a few weeks and see if it improves. Then introduce the food back into her diet one item at a time to see if it is a food allergy. My son is allergic to wheat and dairy and gets a skin rash when he eats a lot of these items. He is also allergic to citric acid, in many shampoos and soaps as well as citrus fruit. He sniffs a lot. Does she seem congested?