HI, thanks for using healthcare magic This may indicate that there is a problem with the absorption of food particularly fat. Poor absorption of food (malabsorption), can occur due to different possible causes such as: (a) celiac disease (b) inflammatory bowel disease (c)disease of the gallbladder , liver, pancreas (d)parasitic infection (e)lactose or other food intolerance (f)side effect of medication If this continues, she should consider visiting her doctors office. A stool sample can be sent to the lab for analysis. Blood tests or any other investigations would depend on examination and stool sample findings. I hope this helps