Sometimes she quotes this evidence. More often she paraphrases or summarizes. But she always uses details that everyone would agree are clearly present in the text. Notice as well that the writer makes sure the essay conforms to the rules of standard written English. All the sentences are complete.
Subjects agree with verbs.
Spellings are correct, and so on. Writing your own answers, you should worry most about providing a clear answer to the question and backing up what you say convincingly, but don't forget about a final edit for style before you submit each lesson. This essay is a little longer than some topics might require, but not much. If you provide this level of support and explanation, your essays will be about this long also. Chaucer uses several details to shape the reader's perception of Alison.