And honestly, I think there is something wrong with celebrating the death of a woman who had no power and whose primary job was being a mascot. If you think she did have any power you clearly misunderstand the political landscape of the countries she was the mascot for.
If the Queen wanted to go on TV and denounce the evils of UK society, nothing was stopping her. I'm not from the UK, so I've honestly no clue how she used that power - but to say she was powerless is to say that every artist, author, activist, and lobbyist has wasted their life, because not a single one of them had anything like her influence.
She went on TV and denounced stuff all the time. Still doesn't change anything. You're mistaking influence with power. And most lobbyist would have more influence than she actually had.