Has she diarrhea, urinary symptoms, bloating? Is she unable to keep even water inside? How severe she rates the pain on the scale of 0-10 or is it mild, moderate or severe? Is the pain intermittent or continuous? Have you given any medicine? Does she feels tenderness when the pain site is pressed?
This can be gastroesophageal reflux disease or gastritis or peptic ulcer disease. You can give her antacid like tums or Maalox. After 15 minutes of giving antacid, if she does not vomit give her acid blocker like Prilosec. If she stops vomiting gradually sips of water should be give and then some semi solids. If these measures don't help, consulting at ER would be prudent.
Please feel free for your follow up questions.