Your daughter might want to try antihistamines in the interim. "Antihistamines can also relieve itchiness caused by insect bites and stings, poison ivy and poison oak." (Benadryl, Actifed, etc) This in not in lieu of the visit to the Dr but rather an interim measure to help relieve the itching/swelling. I have been attacked by sand fleas many times
and this is what I have used.. but must admit that on at least one occassion did have to resort to getting a steriod shot from the Dr (in Belize)! Now I have Benadryl ready the minute I notice I have been bitten.
Hopefully she finds quick relief...