She certainly isn't "among the best paid people."
But there's no huge corporate health insurance tax, and she won't be spending as much on commuting.
... and on housing. Even Europe's most nuts markets aka London, Berlin, Munich, Hamburg and Freakfurt don't come anywhere close to the situation in the US.
Mean house price:
London: $753,793 USD
USA: $369,147 USD
Average rent per month:
London: $2,992 USD
USA: $1,699 USD
Average home size:
London: 705 sq ft.
USA: 1,800 sq ft.
Estimated homeless population (% of total population):
London: 2%
USA: 0.2%
Annoying comments about housing posted on Hacker News:
London: Not seen
USA: Way too many