HowlerKarma, a girl I watched grow up (most likely gifted, 99%+ achievements in all subject areas) also went through a very difficult phase when she was around 8-9; she was very moody and difficult to communicate to then she went back to being herself. She did hit another rough patch after she turned 18 but that probably had more to do with external factors.

I think I'm being paranoid because I feel we're making all kinds of wrong decisions for her and she's going to be really resentful when she realizes how incompetent we are as parents.