I don’t know the details of this case, but if he didn’t harm her, I don’t think it should be the State’s decision. Was she pushing him away? Was she hurt? Or did the State interfere because it could?
It does sound like she had a bad case of Alzheimer's. But one thing that comes to mind is that the woman must have had lucid moments or why would her daughter take her to lunch in the first place. She must have thought her mother was in her right mind when she first picked her up.