If she sees a GI doctor, mention gastroparesis.
Hi there!
Well, without a detailed clinical evaluation it would be difficult to determine the cause of her symptoms. Possibilities that may need to be considered include GI infections, inflammations, GERD, ulcers, chest wall inflammation, costochondritis, causes related to the respiratory tract, pleuritis etc. I would suggest discussing the situation and the management plan with her treating pediatrician.
Hope this is helpful.
Take care!