If we look closely at Kelli's story we see that she clearly hears the initial sounds of words. We can legitimately commend Kelli for her accurate perception of initial sounds before trying to raise her awareness of consonants and vowels at the middle and end of words. Children's stories contain bits of knowledge from many sources. Later on she may write stories which are a patchwork of all the stories she has heard, perhaps borrowing snatches from Little Red Riding Hood, Snow White, and Cinderella while also including bits of her own experience such as apple picking. This amalgamation of knowledge is not just a charming stage children pass through on the way to writing original stories.
Professional writers work the same way.
They simply write with greater subtlety and skill. They design a character based on a person they have known, sometimes borrowing personality traits from one person while using another's physical characteristics. The thoughts and feelings of this character, however, may come from the author herself. Settings may be based on places the author has visited and the situations the character faces may be derived from the author's own experience. Instead, we can tell them how adult authors use their experiences in their books.