S.B.
Extreme swelling and difficulty breathing are the major ones that come to mind. Usually if you are going to have a bad reaction it would come on rather quickly, I think. Keep an eye on her, but she should be fine. Comfort her, make sure the stinger is out of her foot, and put a paste of baking soda and water on it, and maybe a cool compress, and some tylenol for pain. Poor kid, getting stung sucks!