mia_b - I'm very sorry to hear about your Nan's experience at the homes. This should never have happened to her, whoever owned the home.
I believe Vitty knew some of the people who worked at the homes and they were very unhappy with their own conditions of work. So, it is hardly surprising that some of the elderly were neglected if the staff were miserable. Perhaps you should report what happened to your Nan to your local council, even if it is a little while on they might move to protect the residents if they need it.