As long as she isn't intentionally flubbing tests, then it sounds like the stereotyping is the only issue. Social flexible is itself a gift. Chameleons often have small ways to dust a conversation with hints that there is more. As long as it isn't a complete mask, and look for opportunities where she can fully unleash with true intellectual peers.
Not sure how to counter that stereotype, my son certainly isn't helping the cause
When a teacher may encounter an HG+ kid once every few years, when non-subjective differentiation isn't a standard part of a school, then stories of the marvelously gifted but non-quirky kid don't circulate.
