Ok, let's slow down a bit. Though surgery is something that may have to be done, you need to try fixing diet first.
First, get her to a good childrens hospital that specialize in childrens GI, her ped is out of his league on this.
Digestive enzemyes before each meal will help break down and help process the food. All that "red sauce" food needs to go! She needs lean meat (chicken/turkey, no pepperoni, pizza etc.) along with veggies (raw is best), non-acidic fruit, whole grains. Chocolate is a huge no-no also!
A teaspoon of manuka honey in warm water will sooth her throat.