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It seems like your daughter is having acute urticaria
.It is characterized by itchy red or skin colored raised wheals which is transient, that means appears in one place, disappears from there to appear somewhere else. Depending on severity lot of such lesions can occur simultaneously.The most common cause of acute urticaria is food. Seafood, meat, poultry, egg, milk, apples, brinjal, strawberry, coloring agents etc are commonly implicated. It is subjective and any food can cause it. Other common causes are medicines, infections, insect bites
It might take 3-5 days for it to come down. Try to find out the trigger and avoid it. A long acting antihistamine like cetrizine
also will help. Calamine
lotion will soothe the skin.
Hope this helped