Mom is perfectly capable of knowing when she needs to 'go' and she goes through all the right motions, but often she's not at the toilet. Her other toileting locations are kind of predictable. If I put commodes there would it help? Or, if I use some sort of deterrent, I was thinking of those carpet runners upside down so it would poke her feet (gently) maybe I could keep her out of the corners of the room and guide her to the actual toilet.... I also thought about getting a brightly colored toilet cover for her to key in on - or at night having lights point at the toilet? Any ideas?
I would suggest that you take her to the bathroom and sit her there at her normal times or a schedule that you set up. They do this for my cousin in Memory Care and it works pretty well, although, she still has accidents.
If the clean up is becoming unmanageable, you might consider getting your mom an adult onsie that buttons in the back and doesn't allow them to take it off by themselves. Maybe that could control her going on the floor until you can get to her and supervise her bathroom visit.
Certainly have the pathway and bathroom well lit or provide a bedside commode at night. I wouldn't place anything on the floor as a barrier, that could contribute to a fall.
The simplest solution is to take her there yourself. You might want to consider a toileting schedule during the day, take her to the bathroom at regular intervals so she will be less apt to try to go on her own.