It's not all too uncommon to decide to stop something yet keep doing it till it the last possible moment. I do agree that it was staged in the sense it felt like she didn't even try to play correctly this time, but the fact she was still sitting there reveals it wasn't an easy decision.
Man. They took a CT and MRI of my head last month, but said everything was normal, yet I still had completely forgotten lines like that. Maybe the doctor was lying... Not that I'd have gone there complaining about poor memory. But yeah, that does explain it. School boys can be such shy brats.