Sorry, but your point seemed that you didn't undestand why so many people felt something about her death, outside of the UK. What sort of answers are you expecting outside explanation that:
1. for some people, she was the ruler of a country and it is not unusual for head of state to generate reactions among other people, especially when they are important/long running, even outside their home country.
2. for other people, she was associated with a saga that started with Lady Diana and continued with Meghan Marckle and William (or Harry, I don't know which is which) and made people magazine sell millions of issues, so they feel a page has been turned
3. for other people she is "just a famous lady" and many people feel something about famous people dying.
If your point wasn't just this question, then yes it's possible you didn't communicate it well, at least not well enough for me to understand it.