Allow me to be critical.
I interpret that you are talking about a child. To achieve such mental strength as the end of your story suggests, it loses credibility. How can a child who does not speak or has chosen to speak as little as possible learn if not from encounters (through other people, mentors, role models, books etc.) that subsequently allow it to maintain its faith?

From what exactly, would be my provocative question, does any child, indeed any human being, derive spiritual strength if he or she has not first undergone what is commonly recognised as a process of maturation? The accepted hero stories always tell us that before a hero becomes a hero, he has experienced pain, error and suffering, which is necessary to become a hero, hence to free oneself.

The new hero stories, however, and what people scoff at because Hollywood has recently decided to tell them that way, is this: The heroines (they are mostly female now) achieve their mental and physical power just out of nowhere. It comes to them without any previous history, without them having done anything for it, so without having trained hard and without having suffered from insecurities and setbacks, doubts about themselves. Is it not so, that there needs to be a decision that despite these hurdles, one continues to walk the difficult way? And freedom comes to mind and heart as a consequence of that?