Uh, no, this subject is a tangent and we shouldn't really get into it here.
However, a couple of general statements: There are reams of genetic and psychometric data available. More than enough to develop pretty good idea when and where the most probable selection events for good brain genes occurred and how fast they spread. Your word 'premature' tells me something about your acquaintance with that data.
Also, there is one very simple rule: totally genetically isolated communities only have access to their own mutations. Their population is small, so the number of mutations is also small. Non-isolated communities get swept by every positive selection event that comes along.
I agree that this is a tangent - my point was that it's not a relevant tangent because (without disagreeing on any of your genetics) this woman's odds of becoming a professor after being born in a tiny soon-to-be-extinct tribe on a tiny island in the Bay of Bengal were negligible regardless of her intelligence or genes.
