My mother has 6 nieces and nephews who live within 20 minutes of her. Her only sibling, her sister, lives 8 hours away. Her sister was in the area, staying with her daughter, for two months. She was only 20 minutes from my mother yet only came to see her 3 times. No one calls sends cards or anything.
Furthermore, when my mom first went to AL my aunt and her daughter took several things from my mother's condo. They never told me and I am my mother's only child. They later told me my mother gave the things to them. My mother says she didn't and is very upset about it. She keeps telling me, "I've got to get rid of this anger." Would counseling help her? Her dementia is to the point where her reasoning ability is nill.
Your mother might find yoga a helpful way to relax and get rid of anger, if she's physically up to it. Or possibly some kind of group activity like painting lessons or a sing-along, to take her mind off things,