HI, thanks for using healthcare magic Watery stools are not in keeping with bulimia. That condition is associated with induced vomiting. If she is having persistent diarrhea along with the vomiting then she needs to consider the causes for this as well eg irritable bowel syndrome, food intolerance, side effect of medication, thyroid disease, diabetes, inflammatory bowel disease or infection She should consider a food diary to see if there is any link with any particular foods or ingredients. Start with simple less costly bloods like complete blood count, thyroid function test, diabetes screen I hope this helps