I wish I could get my DD's to do a lot of the things this little girl is doing. You've got her on the right path, and seem to be headed in a great direction. Your cue about keeping the rear knee inside the foot - and therefore reducing the over-shift of weight to the rear foot - is about the only thing that jumps at me as a "fix". At this age, it shouldn't take long to re-program her. Keep it up!!