That's not how I understand it. It's more about intensity and drive. I believe it is possible to be PG in one area.
Remember, too, that many kid develop asynchronously, having "math spurts," for example, when they're ready for them. At ages 5 and 6, DS7 was not what I would have called terribly mathy. But he did some 2+ years of math in about 4 months last year, and suddenly, he was years ahead in math, too. He just hadn't been all that interested before, but suddenly, he was ready and he was interested, and BOOM!
She may just be on a language kick right now.
