Ideas for dealing with bowel incontinence?

My MIL lived with us for a year and now is in sr housing apt a minute's walk away for the past 2 yrs. She has been totally incontinent of urine for a couple years (and we've had all available treatments, even a spinal cord stimulator - none of which helped). She is now progressively incontinent of bowel too, and despite wearing depends 24/7 she ends up calling for me to clean poo off the bathroom floor, etc a few times a week- tosses stool crusted clothes in the hamper (I have reminded her to just put them aside to be prerinsed). Her trash in the bathroom was full up with poo soiled depends and poise pads today. It appears to be a mix of bowel urgency and poor mobility, arthritis everywhere. We've been for GI consult and she was told that her muscle tone is nonexistent, take immodium daily. She is also becoming more overweight around the belly over past few years. Tired of cleaning up poo!