What did she do? She showed up in the public eye, existing as a Black woman who married one of the most eligible bachelors in British history. That's what she did.

People will always find a reason to pile on a Black woman (actually this is any woman) who shows up in public for any reason. A lot of people use their hatred of various celebrities to express the racism and misogyny they know is unacceptable in their daily life, and will invent reasons why that person deserves it, why they engage in it, and act like they're actually accomplishing some kind of goal when they do it.

They haven't changed a single dam thing about her world. She's still rich, with a husband who adores her, and now she has a TV show. What did they accomplish this year? Or any year? Bullies are so busy paying attention to their (made up) victims they don't have any energy or time left over to do anything worthwhile for themselves.