Wait, how did she help the teacher turn it into a 'teaching moment'? What I got from it is that neither of them contacted the teacher at all about any of this,

Wait, how did she help the teacher turn it into a 'teaching moment'? What I got from it is that neither of them contacted the teacher at all about any of this, and then expected him to be able to spot the issue and understand that it was a problem with his class rather than an issue of burnout or other normal teenager problems (I doubt the boys in the class harassed her in front of him). My guess is that he was actually less worried about her because she was actually doing well in the class and I imagine many of the students weren't. Sure, it is a real bummer that she was turned off of the programming industry because of her classmates, but if he had devoted most of his non-teaching time to just her, imagine the struggling students in the class who might have wanted to learn but couldn't get any of the teacher's time or help? Odds are they would be demoralized and unlikely to continue programming as well. It most likely could have been handled better, and it would have been great if the teacher had noticed the problem, but I don't think it is fair to place all the blame on him and suggest that they were helping him do the right thing.