I think you are being a wee bit harsh, here, CBF. It reads to me like this community has been patient and tolerant – fixing up damaged property without penalty, for instance.
But I think the progressive nature of dementia and its disruptive nature raise valid concerns about the future impact this poor woman might have on her neighbours.
A simple and compassionate solution, such as suggested by Scottie, could nip this particular aspect of the problem in the bud.
But I applaud your sticking up for the oldies. Ageing population is a concern in strata because of the large numbers of retirees involved.
However, unlike ‘housies’, we can’t pretend that we are respecting people’s privacy when what we are really doing is ignoring any problems that might exist on the other side of the picket fence.