Her musicality is great(!), although I must say that I'm quite concerned by her posture, her right hand position, her left hand position and that her right hand thumb is in the sound hole.
Clearly, it's not my position to tell anyone how to teach, and I don't mean to be overly critical of your teaching when I say this, but after 18 months of lessons I would expect that correct posture and hand position would be enforced and engrained in students - especially at that age as they're like a sponge when they're that young. Is there a reason that they're not?
Negative, I am a meat popsicle.