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Queen Elizabeth II will be remembered as one of the Greatest Queens because of her stability in one of the most changing era's in British history. She has rolled along with it exceptionally well, when most Kings & Queens around the World have faltered or fell completely away.
The difference between a Queen (or King) and Empress (Emperor) is that a Queen is a Master of Ceremony (Enterainment/Tourism/Music/etc) and an Empress is a Master of Military. Presidents are Masters of Politics (Law/Police/etc)
And QE2 has done exceptionly well with the pomp and pageantry. Even has a Luxury Cruise Liner named after her. British Royalty merchandising rakes it in like Star Wars does for George Lucas.
In the Art Show 'Everyone's a Critic' - A Man and a Down-Syndrome Man gave their view. The Man recognised the 'Queen' and the DS Man saw the 'Mother'. And she has been to many millions around the world and yes - even to other Nations. She will be missed when her time comes, but you can see it in her eyes that she won't be going until this Global Crises is dealt with. She has that fire to see this thing through.
Climate Activists are right and I think the Queen knows it. That the 'Health of the World' is our fault and this Virus which has taken this entire World's attention like never before in our History, not even the World Wars took the 'entire' world so abruptly - is now a stark admission and one day reminder that we need to Clean Up this World.