I am not able to provide medical advice without performing a complete history and physical examination. Your mother is having loose bowel motions (diarrhea) but I cannot make a specific diagnosis. Hence, it is best that you address your concerns to the physicians who are caring for your mother. There are many causes of diarrhea and I believe she will need a complete evaluation and a specific diagnosis in order for a specific treatment to be administered. I am not sure diet will make any difference. I suggest further consultation with her physician.