If there is childhood perfectionism or anxiety, there are books which show readers how to free themselves from thought patterns which may not be serving them well. While insightful, these books are written gently for kids, in a style that is fun and engaging. Parents may wish to pre-read and decide if a resource may be a helpful tool for their child.

This old post mentions some books on anxiety.

A book which seems to understand perfectionism very well and which many find supportive is "What To Do When Good Enough Isn't Good Enough" (https://www.amazon.com/What-When-Good-Enough-Isnt/dp/1575422344/).

Another book you might like is "Perfectionism: What's Bad About Being Too Good" (https://www.amazon.com/Perfectionism-Whats-About-Being-Good/dp/1575420627/).

There is also an article on the Davidson Database, titled Interview with Thomas Greenspon on Perfectionsim.
(https://www.davidsongifted.org/gifted-blog/interview-with-thomas-greenspon-on-perfectionism/)

Perfectionistic tendencies may be a sign of developing a fixed mindset rather than a growth mindset. One aspect or application is that gifted kids may stop taking appropriate risks in order to always be "right" or always be "smart" or never be "wrong", and this may work against them. The concept is nicely summarized in these youtube videos:
- Ashley Merryman & Po Bronson: The Myth of Praise (link-
)
- Carol Dweck: Teaching a Growth Mindset (link-
)

Parents may wish to read the book Mindset by Carol Dweck for tips on promoting a growth mindset. It is based on years of research. Not that I agree with every idea/application, but on balance found a number of ideas to be useful.

The mention of these books is not to detract in any way from other poster's suggestions of developing a relationship with a therapist.

Because the previous testers specifically expressed that they did not have confidence in the prior test results, I would tend to lean toward more thorough testing with Dr. Silverman. It is possible that she may even be able to recommend a therapist in your area and that the new test results may be insightful for productive therapy.

Unfortunately, in school and elsewhere, gifted kids may be subject to negative commentary born of myths about giftedness. Inflated and unrealistic expectations placed on gifted children may lead to, or fuel, anxiety and perfectionism. It is possible that with having a support team that understands, validates, and affirms their giftedness without undue pressure to perform, they will be able to create realistic goals and expectations for themselves, and become less vulnerable to other's expectations.