Sadly this is not unusual as some people get older they become very selfish.
It is unfair to expect neighbours to get involved.
An “aunt” of my husbands was very demanding, we would do a 40 mile round trip to move something in the garden.
I once spent a whole day with her cleaner and daughter scrubbing her filthy house, when she got back to a sparkling home 9 hours later she got angry because we had thrown some 10 year old newspapers away, it was so bad we wore face masks, she had never allowed her cleaner upstairs.
She cultivated a couple in the village who madly ran around for her, as a childless widow her estate was sizeable, the poor couple were promised the earth and got nothing!
I certainly wasn’t in it for the money, I was just wanted her to be able to have a home clean enough to let social services in so she could get a care package and hopefully take the pressure off us helpers.
By the time she was admitted into a home she had fallen out with just about everyone who tried to help her.