What Causes Pain Around The Belly Button And Diarrhea In A Child?

My daughter is 6 years old. She has been complaining of stomach aches for months around her belly button. At times it was so severe we went to her pediatrician. They said it was a stomach virus. Yesterday, an xray was done and it showed severe colon impaction. She has been on 8oz of Gatorade with 1 cap of miralax every 2 hours since 10am this morning. She has had 2 very small bowel movements. However, she does have liquid diarrhea and is passing food she has eaten in the past 24 hours. She does not have a fever and at the moment is not in pain but the pain comes on suddenly and can last for hours.