Mother has pretty severe dementia. It gets continually worse, and she cannot carry on a conversation. She says the same few things everyday - subjects she thinks she can talk about. But she just repeats what you say and then repeats it 10 or 12 times more. I get to the point I have to ignore her. Honestly I want to scream. She pouts a lot and gets very defensive and nasty if you try to tell her things that have to be said, like leaving the door open, answering the door to strangers, etc. How do I handle this?