Sorry to hear that, I know it's maddening. My mom's sister was yelling at us to demand the doctors give her the horse paste. She believes that armageddon is going to happen before she dies too, because some old lady at her church told her it would. One of my mom's close friends told my partner at her funeral that "she died for what she believed in" and insinuated that we were lying about her asking for the vaccine. Same breed of psychosis.

At the end of the day there's no point trying to argue or give them any energy or thought, you can't reason with that level of delusion. This is one of those times where living well is a radical act.