Been there already, and we opted for disclosure. We explained to DD7 how her extreme emotional range is tied to her intellectual abilities. She hates the former one but values the latter, and understanding how they come as a packaged deal helps her come to terms with something she would otherwise see as a personal defect.
I'm also trying to help her see how emotions, properly channeled, can be a source of strength. It's passion for learning that fuels us to master new skills or materials, determination that pushes us on when it gets tough, etc.
The last piece of this puzzle is helping her learn to vent those emotions in acceptable ways when she feels out of control. She's been showing a lot of progress there lately.
