Hi dear,
I can understand how difficult it is for a parent to see his child in pain, stay strong and you are doing very well so far, just to sooth you down as long as the Doctors has done the above mentioned tests, mainly CT and not finding anything serious so far then you can rest assure that your daughters situation is mild and will go some time soon.
The cause of abdominal is usually difficult to trace once tests show normal results.
If you came to my clinic and i see that all tests seem normal i would consider doing
Allergy test, to rule out possibility that your daughter is possibly allergic to some kind of food.
I will give you below the possible causes of your daughters situation and what you should do ..
1.It's very possible that you are daughter has Lactose in tolerance or allergy to milk protein, they are both not the same but they can be both caused by dairy containing food or drinks, what you should do for now is try to avoid giving her anything with dairy or anything that contains milk for a week or two and look for improvement of symptoms
2.
IBS (
irritable bowel syndrome ), if you visit a Doctor again talk to them about possibility of IBS so they can consider to evaluate her well and see if she has symptoms of IBS , the doctor will look the
abdominal pain time and defecation and consistency of stool.
My advice is that for now continue giving her
ibuprofen to reduce pain and stop giving her any food that has any diary products and see if she gets better soon..
Wishing you and your daughter all the best, and i hope she gets better soon...