Agreed. This is impressive in how fast she has ramped up. I’d guess she’s also ok with not every dollar being 100% effective (ok with failures) as a trade off for speed of execution.
Part of the flaw with assuming people who are really good at one thing are good at other things applies to philanthropy. Is Bill Gates a good philanthropist? Zuckerberg? What if they're abysmal at it but we don't have anybody to compare to?