You need to pay attention to details, symbols, and themes. Analyze the structure and character development. Also, consider the historical and cultural context.
I'm not sure who Ashylnn C specifically is without more context from the story. It could be a character created for a particular fictional story, perhaps a young girl with her own unique experiences and adventures in the narrative.
The main idea is likely about how all stories are interconnected in some way. Foster probably argues that there is an overarching 'big story' that encompasses all individual tales, perhaps through common themes, motifs, or character archetypes.
The book breaks down complex literary elements and shows you how to analyze them. It gives you tools to dig deeper into the story and understand the author's intentions better.
First, know the c c c world well. Read the original material carefully to understand the characters, settings, and basic plotlines. Then, come up with an interesting idea. It could be a 'what - if' scenario, like 'what if this character had a different power?'. Next, start writing a simple outline of your story, including the beginning, middle, and end.