She was 53 years old. Too young to die of starvation in a affluent neighborhood. She wasn't even old enough to apply for negligence lawsuit.

Why the dependency on others? Was she mentally unstable? Is her family also well to do people?

The neighbors probably didn't give a freaking care because they thought she was rich enough to hire people to help her.

Money and Greed poisons everything. It creates false sense of security that everything is going to be alright. In a materialistic world, altruism is dead. Half of the modernised cultures in this world doesn't even know if Altruism ever exist.