Red Dye #40

Sabra is still battling the occasional stomach cramps that just knock her down. She has a multitude of blood and stool tests and nothing unusual has showed up. We go in April for an abdominal ultrasound. After keeping a food log we're wondering if eating "red" things make her stomach hurt. Cherry drinks & lifesavers, strawberry jello, and spaghetti sauce seem to bother her, but not everytime. After comparing ingredients Red #40 is the common denominator. Has anyone looked at this for themselves? I googled Red #40 and it has quite of number of bad things associated with it, but it was not much on medically documented material.