My 94 year old mother is obsessed about her bowel movements.

You might try a motion-activated toilet night light — it clips right onto the toilet bowl and gives off a gentle glow so your mom can see without needing a flashlight or harsh overhead light. Some have softer colors (like amber or red) that don’t mess with sleep. A popular one is the IllumiBowl, but there are plenty of similar ones online. Adding a little night light in the hallway can help too. Simple and inexpensive, but can really make a difference