spends a much smaller proportion of income than the rest of us on basic expenses. So she can afford the taxes on the investments she makes.

I don't begrudge her her amazing income, but I'm also not worried about her having to pay the same tax rate as anyone else. And I think people with 90 million dollar homes should pay proportionately higher taxes. Even at 50% total income taxes (or whatever her amount is) she would still have more disposable income than the vast majority of people.