It's certainly possible that it's a reaction to Red Dye #40 but there's a good chance you would have noticed the sensitivity years ago - there's Red Dye #40 in practically everything (including Children's liquid Benadryl)
It's possible that your daughter can tolerate the dye up to a certain amount before she has a reaction. Red colored drinks tend to have much more dye in them than, say, red M&M's.
[This message has been edited by kitaki (edited 07-22-2003).]
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