Generally as far as monitoring goes in the IT business, if there is a known issue, repairs or something of that nature, those devices are not monitored to keep from opening tickets for no reason.  If the elevator was under renovation and the elevator company was told not to monitor it, that would be the reason.  It would be difficult to foresee someone with dementia getting into the elevator and getting stuck.  The bigger question would be why was the elevator left in service outside of the hours of the renovation?