The thing about first example is that the speed of brain development in child and adulthood geniality/iq/whatever are only loosely related. It is perfectly possible for a child to be bad in math in first few grades and good later on. It did not had to be test, it is perfectly possible for him to be slower at that age or him having lower attention span. (That assumes school systems that wont give up on such child as bad early on.)

The situation of women now is a lot better then it was in 19 century. There is some bias and unequal expectation toward gender, but nowhere near as was at the time. While all the kids now know what is supposed to be girly toy/profession and what is boyish, there is no particular stigma facing working females nor female mathematicians. The 'it could easily play out like that now' is far from being accurate.

I don't think you are helping equality when you compare stigma of being women who knows stuff with unequal representation of genders now. One, you are lowering her achievement and strength of will which had to be huge. I would say she was anything but fragile. Two, you are not doing service to women now - our situation is not the same as situation hundreds years ago and talking about it as it would helps no one.