When her mind started to deteriorate, her family dumped her in a nursing home and forgot about her. She felt abandoned but she was pleased to find that one of her grandsons was still actively checking up on her.
Source: CreepyWorld
She appreciated her grandson for not forgetting her. But as it turned out, her grandson had been visiting her for another reason. When she found out his true motives, she made sure to teach the boy a lesson – one that came from beyond her grave.