Very cute kid. This sort of shot is helped by having catchlights in the eyes. You can sometimes create them in photoshop if they are missing as in this example.
Very nice capture--gorgeous expression and great color. It's very natural and simple. I would like to see a bit more light in her eyes. Perhaps a reflector held near her face would have provided more of a catch light in her eyes? Or perhaps a diffused fill flash made by taping a bit of wax paper over the flash (I don't know how sophisticated your equipment is---this is the sort of thing I have to do).
Some good use of backlighting, but the red in her skin tones could have been easily fixed in post, and leave her looking feverish. The focus seems just a little too forward of her face as well.
She's a cutie. The DOF is nice but I feel like the lighting could be better. Her skin tones are awfully red - maybe do some work on desaturating it a bit. I'd like to see more of a glint in her eye too.