Daughter was sick with rotavirus in May (the doctor said it was most l…

Daughter was sick with rotavirus in May (the doctor said it was most likely), after that her stomach settled, they treated her for a long time and followed a diet for almost a month, now it's been a month since we returned to the old menu, but the daughter still has loose stools, not diarrhea, but looser than before, plus an unpleasant breath odor. I want to take her to a gastroenterologist, but the medical care here is not so good. I would like to know, could someone tell me what tests and analyzes should be done at this point?