Hello and welcome to MedHelp and our forums. Thanks for your question. We are glad you are working with your child's doctor and urge you to continue to do so. One possibility to look into is abdominal migraines which are not uncommon in children. https://www.webmd.com/migraines-headaches/abdominal-migraines-children-adults#1. Take a look at the article.
Kids are often hard to diagnose because they have a hard time telling us exactly what is going on. You appear to have ruled out gastrointestinal issues. The abdominal pain, queasiness and then vomiting seems to fit the profile of abdominal migraines.
We hope to hear back from you for an update.
How is your daughter doing? I have a son with a slow digestive tract and chronic issues. What's been going on with this? Any update?
Thanks for following up. She has gone to get her tonsils removed at the beginning of June and the doctor said that they were very infected and had a lot of pus on them and enlarged. They said it could have been the drainage from that that was causing her stomach issues. She has only had 2 episodes of stomach pain since her removal and no vomiting. We are so glad she got her tonsils removed and she seems to be doing better!!