I can see why you prefer the little girl in the first photo.
But is there a reason you prefer the big girl in the first photo? She looks nice in both to me.
I'm so sorry, there's still no better method than the one I first described. You'd need to work patiently on a dodge and burn layer to get rid of the rest
I think this is perfectly feasible, it will just take a LOT of patience. A lot of borrowing tiny parts of the three to form a 2, lots of tiny cloning.
I made a bit of a start: