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According to this administrator, most HG/PG girls learn to manage their behavior well in any classroom setting (early maturity?) and read a lot to compensate for the lack of challenging education and have much more self-control in the typical classroom. She said that many parents of gifted girls realize that their child needed more challenges much later because they do not exhibit unhappiness about the school situation often.

I also think this is true. The interesting part for me is that I have a male child who is obviously gifted but not disruptive (good at self-directed work) and teachers have been very quick to notice and enrich him. (He is not quiet with his abilities but will not dominate, either.) There have been comments about how he's not "like" other bright boys. I think he has gotten a lot of advantages due to being both male and having a well-developed superego.