"4'7" vs 5'11" -- From my experience, 5'11" is really tall for Japan. Poor girl must suffer from near daily head injuries."
And I suspect 4'7" is really short even for Japan.
When I lived in Osaka one of my local markets had a young cashier woman who... I never tried asking her height, but she had to hold her hands at or above shoulder level to use the cash register. Definitely seemed short even for a society where 5'2" is the average for women... Wiki says standard deviation is 5 cm/2 inches, so 99.8% should be within 4'8" to 5'8" (3 standard deviations, 6 inches of the mean.)
So they're both statistical freaks. Tall girl even more so than smol girl, especially with them being in high school (though probably they're both at max growth.)