Hello. My 89 Year Old Grandmother Is Having Sever Diarrhea.

Hello. My 89 year old grandmother is having sever diarrhea. Her doctors have given her meds to try and control it and it appears to be working but the odor is very Foul. She recently fractured her Hip and we (the family) are just trying to figure out what is going on. She had her Gall Bladder removed several years ago. She has a good appetite for someone her age but we are just worried..