know the basic plotline of what happens to the three main women.
identify what text forms are used in the text, and find language/textual features which exemplify these forms
textual integrity, as ive said before, is about how well a text adheres to a certain genre.
you would argue that because WS is a mishmash of various genres (identify through language), it has little/no textual integrity.
for that question jimmik mentioned, you could first discuss how the personal voice is represented through the text. link it to historical and cultural (these overlap a bit), then you could start discussing how it reveals other genres, such as feminist, biographical etc. this shows that the book doesn't adhere to one set genre, compromising the others and therefore compromising integrity.
something like that.