After reading your history it appears that your dauhgter might have developed dermatitis
problem over the affected area. You can apply a calamine lotion with cortisone
cream over the affected area. It will be better for you to take a good suggestion from a dermatologist
. You can take benadryl
for itching part. Do not expose her to hot humid weather, let her wear cotton clothes and clean the are regularly for 3-4 times with cold water.