I did this too . . . chasing a lot of dead ends. In the end, I just needed to give her time. It actually took ten months before she was completely symptom free. In the meantime, everytime she had an issue, I was chasing down or eliminating something that turned out to be nothing.
It's not necessarily the food that is the issue but the fact that she's got a damaged gut trying to process it . . . just like a nasty papercut, it hurts until it heals even though you are no longer swiping your finger down an envelope (or whatever initially caused your cut.)
I would suggest that you try to keep the food as simple as possible . . . it's hard with kids wanting a treat or something "normal" so do the best you can. Eliminate anything that you know is bothering her and try it later down the road. I also recommend using a digestive enzyme (this has helped my daughter immensely) and a probriotic would also be helpful.
Thank you!!!! I, too, appreciate the paper cut analogy! A probiotic sounds like a great idea, will definitely bring it up to her doc next wednesday. ;-)