(Apparently I am incapable of a single post this morning. Ah well.)
Thank you @indigo and @polarbear and @blackcat and @MSP for bringing up bullying. This was not something I had seriously considered before. Reflecting back earlier in the year, there was some stuff going on with a classmate that maybe would be considered bullying. I don't know enough of the details (nor did the teacher when we discussed it in the fall) to know exactly what was going on, other than to say it was not physical. DD's response was to avoid the girl, and she says that works. But I wonder if that has led either to her avoiding all the other girls, or the other girls in her class avoiding her.