dear user first you should know that it was good behaviour to do x ray and blood test to role out any intestinal obstruction or other severe problems......upper abdominal pain with vomiting may be indicative of gastritis that means inflammation of upper part of stomach or may be due to gastrooesophageal reflux disease.....gastritis occur due to spicy food or coca drinks and soda drinks also any hot drinks can cause this gastritis as any drink or food errosive to stomach will lead to that....also over feeding can lead to vomiting and upper abdominal pain...and there is important point to know that severe stress or emotional troubles can lead to these symptoms.....simply you need to monitor her feeding behaviour and avoid any stress or anxiety and there is some medications help improvement if symptoms persist like rantidine and domperidone.........wish your daughter happy healthy life