Lovely photos, your subject certainly doesn't seem to mind having her photo taken - make the most of that as it doesn't last!
My only advice would be to get down lower, these are taken from a very "adult to child viewpoint" and I find pictures of small children look much better taken from their eye level or below.
You do not see too many adult portraits taken from this view.
Unfortunately a low viewpoint normally means crawling round on the floor. I used to sit my sons at a tall table and give them something to do - this keeps them in one place and distracts them from noticing the camera too much
This one I was lying on my side on the floor - hoping he didn't fall over as he was only just sitting up unaided!!