It's all over the map, from Size 7 US there to Size 8½ US (39EU)
to Size 9 US (41 EU):
to Size 10 US (42 EU):
I've researched a lot of girls on this site and never seen one with this much conflicting info. Your guess is as good as anybody else's I guess. *Best* way is go through the gallery and see if you can find the size printed on the bottom of a shoe, or look for charity auctions of her shoes on eBay.