Bless her heart. I have some nerve damage in one side of my face that also affects my smile, and I know how hard that is!
Is she having any other symptoms you might not have thought about? I often chew on the inside of my cheek by accident, and my nose on that side is not as open as it used to be. These aren't things I would not have associated with nerve damage, but they have been present since. My eye on that side also tears much more than the eye on the other side, so much that I no longer wear makeup very often.
Anyway, call the doctor. When does school start? Perhaps you could have her evaluated by a local neurologist and take the results to Dr. John.