Final answer:
The detail that best supports the theme of valuing getting out of one's comfort zone over performance is Caitlin stepping out of her comfort zone. This shows personal growth is deemed more valuable than perfection.
Step-by-step explanation:
When identifying a theme in a given story, details that show character growth and how they respond to challenges are often key. In the excerpts provided, the most relevant detail to infer the theme 'Getting outside of your comfort zone is sometimes more important than giving a great performance' is given in the instance where it’s mentioned 'Caitlin stepped out of her comfort zone.' This shows that despite any difficulties she encountered, the act of challenging herself and stepping into new experiences was a valuable part of her journey, thus supporting the theme of valuing personal growth over flawless execution.
Furthermore, the additional details such as handling responsibilities, overcoming fears, and the conflict between knowledge and self-doubt all contribute to this overarching theme by illustrating the personal development that comes from pushing beyond one’s familiar boundaries.