Answer: It allows her to use the engaging elements of fiction, such as dialogue, characterization, and a plot that builds to a climax, while telling a compelling and relatable true story.
There are several differences between fiction and nonfiction, but an important one is the type of literary elements that each one allows for. When writing fiction, an author can use devices such as characterization and dialogue that are not possible in a work of nonfiction. In this case, although the author is telling a relatable, common story that could work as a nonfiction text, presenting it as a work of narrative nonfiction gives her the opportunity to use all these literary devices to make the story more compelling.