What to do when your loved one won't use the bathroom but once a day?

Callie, try one of those toilet safety rails that adds siderails she can hang on to. sometimes it is the fear of falling or not having something to grab on to.

Are you referring to your grandmother? How old is she? What other medical issues does she have besides Alzheimer's/Dementia?

What were her bathroom habits before she developed memory issues?

Is your grandmother physically active? If not, does she not eat much? If she isn't eating much because of not being active, it wouldn't be unusual to only use the bathroom once a day.