Left hand looks pretty natural (if perhaps a bit small), but she seems to be lacking in right hand technique...
On the other hand, it looks almost as if the upper horn is braced under her chin, sort of like a violin, so maybe there's a bow being held off camera?
How old? Is this by chance the one about to graduate high school? Even if so, School Days (which I refuse to learn, even if Stanley still insists) appears to have been recorded around '76, so that math wouldn't quite work out...