Im sure the private residence at the 4 seasons in SF and the tens if not hundreds of millions she is worth had plenty to do with her not burning out as well.
Further, as others noted - that is ~18 hours per day "working" - and if by "working" we really mean, thinking about her work.
This means that she could just as easily be "working" when being chauffeured from house to work, or on the plane or eating dinner.
Its not like she needed to be welded to a screen pumping out code at her desk 18h per day... she has a much different output, mostly her thought and attention, than many others.
Hell no she wasn't. Not as Google employee #20. The implication in the article is that she was actually working in front of a screen. And while thinking is definitely "working", I don't do much thinking without at least a desk.
Further, as others noted - that is ~18 hours per day "working" - and if by "working" we really mean, thinking about her work.
This means that she could just as easily be "working" when being chauffeured from house to work, or on the plane or eating dinner.
Its not like she needed to be welded to a screen pumping out code at her desk 18h per day... she has a much different output, mostly her thought and attention, than many others.