I'm actually not much of a fan of Wonder Tot either - it works okay in Golden Age stuff because the amazons were all superpowered, and it just barely makes a passing grade post-Crisis with the "she's godly, and therefore inhumanly virtuous" argument, but I still prefer a gradual ramping up through adolescence.
Did Johns actually go that far?
I don't know if he has explicitly, but he certainly has implicitly, through the two-days-to-superpowers New Krypton kryptonians.