Her dental health is wonderful, among other things.
That was one of the first things I processed, during my attempt to suspend disbelief, which is not completely successful yet.
To be authentic, I think she needed to be more physically affected by her isolation. The major focus of the film was the effect of her lack of socialization.
I thought the thread "Is she a feral?" might be looking at this but no, not much.
Feral humans might live in a pack of ferals, and thus be adequately socialized. I suppose a whole other movie could be made about that.