Re: Tummy Pains
You would have to see if her poop was hard or soft and what color. Gross I know, but its the only way to know. Hard little balls one day and runny the next is definite constipation. It should be soft and mushy everyday and be light brown in color. Dark brown or black is definitely constipation. (Unless she is eating dark brown or black food) Don't count on her to describe it, its best to look at it for yourself. (Sorry)
As far as dairy is concerned, lactose intolerance can cause stomach pain. I know my husband always gets gas and bad cramps if he drinks a cup of milk.
As far as other things it could be, if it continues the doctor may have to do an ultrasound of her organs.
Hope you find an answer soon!