Being the Queen is one thing, but an aged member of the public is another. They're entirely separate entitities.
Maybe the Queen is undecided on who is going to make a better job of where she leaves off ? Head of State is no mean feat and to be perfectly honest I wouldn't know myself who'd fit the bill as a close second to her for dedication alone.
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.