It sounds like a similar place.
Eventually people will have to move on, and most won't want to, not least for financial reasons. It will be the Manager making the decision, and the lease allows her to.
I have a catch up chat every few months or so, sometimes by phone or email. I try to keep it open, as in I am just catching up to confirm things are OK. I have needed to increase my mums care, and found the expert advice useful. Plus there was an awkward bullying episode when another resident had taken against my mother, which we were able to resolve.
I am lucky in that my mother is relatively well off, so I make a point to pay bills promptly. When I discovered that they were having problems sustaining an activity my mother particularly enjoyed, in part because some other residents are very cash strapped, I offered that my mum would sponsor it. In short, I am trying to ensure that despite the problems caused by her increasing dementia, she is seen as a valuable member of the community. The time will come when her needs are too much for that setting, but I think I have managed to delay the day. And I hope when the time comes, I will understand the Managers thinking and benefit from her help in finding somewhere suitable (and indeed in selling the flat.)