M, time to become emotionally detached from her. Do your normal stuff with family, just don't let the sounds coming out of her mouth affect you. With others around it can only make her look condescending and unreasonable. I was like that with my father towards the end of his years. Sadly, he hated me more for not biting back! Go figure.
No God, No fear.
Know God, Know fear.
Know God, Know fear.