Thank you for the query.
Your daughter problem is probable more serious than just a stomach flu
. White stool is a serious symptom. Stool is brow because it contains digested by bacteria bile.The bile is secreted from the liver through the bile ducts to the small intestine
Due to bile ducts obstruction, stool gets white. It also gives abdominal pain
and cramps (usually radiating to the back), nausea. Diarrhea can also appear. Stomach cramps
and diarrhea can be also caused by partial bowels obstruction due to inflammatory bowels disease.
I suggest you to do not wait anymore and take your daughter to the doctor. She should have abdominal ultrasound
(not CT) to check for gallstones in the bile ducts and distended bile ducts. Liver tests (AST,ALT,GGTP,AP) should be also done. If no bile ducts problem, abdominal CT with oral contrast (enteroclysis) should be the next step.
Hope this will help.