It appears that the correct answer for the genre or category of writing that best describes Grace's work is "general nonfiction." This is because her writing focuses on presenting facts and analysis, typically relying on references and citations to substantiate her claims, which is characteristic of general nonfiction.
Your initial choice of "research" may have been incorrect because while research often involves analytical writing, it typically implies a more specific focus on original data collection or the detailed study of a specific subject rather than the broader presentation of facts and analyses typical of general nonfiction.
An example of general nonfiction from a Disney movie could be "The True Story of the Three Little Pigs" by Jon Scieszka (which has been adapted into animated formats). This story provides an analytical twist on the classic fairy tale by presenting the perspective of the wolf, backed by "evidence" from his point of view. Although this may not be a traditional documentary style, it serves as a creative interpretation that prompts the reader (or viewer) to question established narratives and consider multiple perspectives, much like nonfiction writing.
While Disney typically produces fiction, its adaptations often include real-world lessons or factual elements, making them relatable to general nonfiction themes. Another example could be movies like "Zootopia," which contain underlying sociopolitical messages and analysis of societal issues, reflecting elements of general nonfiction in their storytelling.