My dd is 9 (10 in February) and she's currently 159cm high, size 5 feet and weighs about 6.5/7 stone (I think that's what she said!). I'm having to buy her clothes aged for about 13/14yrs or even occasionally buying her size 6/8 in womens clothes.
I feel a bit hard done by that she's grown out of children's clothes so quickly. She's a real tomboy with a real little woman's figure. It's hard to find her age appropriate clothes in a style she likes that fits her!
She's the tallest in her class, but out of interest is she freakishly big? How tall are your dd's?