Some years ago, a friend was in a similar position - divorced and caring for her mother who lived in a warden controlled environment. Fortunately, my friend was only a few miles away and could visit several times every day, although in time, carers were needed.
One day the carers reported her Mum for being aggressive, police were called and she was taken to A&E, admitted and vascular dementia diagnosed. Her DM wasn’t allowed home and went to a local care home. She then suffered a couple of TIAs and was moved to a different, more suitable care home, where she ended her days some months later.
As my friend has bad RA, it had been deemed that her DM should go into care. My friend felt guilty, but the decision had been made for her.