Ask a Psychiatrist and Get Answers to Mental Health Questions ASAP
It is distressing when our loved ones are not functioning at their best. Remember your mother is 93, she may be on a variety of medication which add to her paranoia/delusions. Act with love towards her. You have a variety of acceptable responses to her, from apologizing to confronting. Maybe look for a response in the middle. You could simply say, I am sorry you feel that way and change the subject or just change the subject. Focus on maintaining a positive relationship. Rather than "visiting" or spending your time talking, look for activities to do together, like playing games/cards or reading to her. She has a lot of time on her hands to think and her thinking may go astray. You don't want to spend your time on that. Just spend time with her, be present.