Strawberry allergy?!

Rias

I gave my DD strawberry yogurt for lunch today. It was the third time she ate it this past week. This evening I noticed a rash all over her feet and legs and her face was flushed. I feel terrible but is it possible that she didn't react the first two times and now her body reacted to it? Anyone have any experience with strawberry allergies or any allergies? Thanks ladies!