Cognitive-behavioral therapy is one of the best evidence-based talk therapies for managing anxiety and depression. From your brief description, it sounds like she may think he would benefit from CBT for anxiety-driven frustration. This does not necessarily mean that he has a clinically-significant anxiety disorder, just that CBT might offer him some additional tools for improving his psychological quality of life. That she identifies a pool of therapists with GT experience is quite a plus.

...pronounced like the long vowel and first letter of the alphabet...