Random guess, she may have been seeing anxiety and/ or perfectionism, both really common in gifted kids, and in testing situations. I wouldn't see this as a reason to be concerned - CBT is a really positive way to learn better self-talk and coping skills, and I sometimes wish it was part of the mainstream curriculum - I think we could all benefit from a little CBT! I'd see this as a good thing, not a big worry: you have a knowledgeable and empathetic psychologist who gets that gifties may need help learning to manage their own intensity, rather than ignoring it as something he needs to "get over" or "grow out of".
