75 year old flouting rules

My mom has always been a bit narcissistic and self-centering. Lately there have been instances of her taking other people's seats at ticketed events (knowingly and refusing to move) and even attempting to lie about ADA status to get preferential treatment at an event. It's an odd new behavior, even for her. I don't know if it's just a case of zero f*cks left to give or a sign of something more serious.

I'm seeing signs of some memory loss and hearing loss, but so far everything I've read says those things are in line with normal aging.