What Causes Dizziness And Abdominal Pain In A Child?

I have a 14 year old daughter that has been complaining of abdominal pain off and on for a week. I took her to our local clinic on Tuesday, her vitals were normal and her white count was normal at 7.8. She has good bowel sounds. She is well hydrated and has been drinking about 60-80 ounces of water daily. She has had good urination and bowel movements. Since yesterday she has been complaining of dizziness. She has not ran a temperature anytime we have checked.