it is not lazy it is some thing to to do with the habit of toilet control and also with the development of toilet control skills. for this you need a specific doctor a psychatrist, who will councell the child and train her and if required he may even advocate a medication. consult the psychatrist not the regular doctor.
they can do a blood test for Celiac - gastro or stomach,intestine problem. It has to do with intolerance to gluten. they tell u what she can or cant eat to make it better.