My daughter got a rash after drinking grape juice: Thoughts?

So yesterday I gave my daughter grape juice. Red grape. It had red dye 40 in it. She broke out in a horrible rash on her butt, and her cheeks broke out. Has anyone had a child with a similar reaction? The odd thing is she can drink red Koolaid and is fine. Anonymous Community MemberThis question was asked by a Facebook community member who has asked to remain anonymous.