Several times a year, I call our state's Adult Protective Services to report elderly persons suffering from abuse or neglect. The case workers investigate and in some cases, have placed at-risk persons in a long term care facility if they are unable to care for themselves. This usually only happens if there are no relatives or friends available to take them in or to serve as guardians.
Although I know nothing about this case, I suspect something similar has happened. This does not strike me as particularly unusual. Every state has an elderly protection division that performs a similar function.