But on second solo?? The student had quite likely had exactly no training or experience of refusing an ATC instruction and wouldn't have had a clue as to how to go about it or even whether it was "allowed".
That's the point I was hoping to make in the rest of my post, about the stupidity in which PPL training is done.
However, I don't see that it is smart to send somebody on a solo flight with "exactly no training or experience of refusing an ATC instruction". These (flying the plane and to hell with doing stuff you can't do) are pretty basic things.