In The Turn of the Screw, how does the relationship between the governess and the rest of the household shape events?

I would argue that the relationship of the governess with
other members of the household, in particular with Mrs. Grose, the rather naive and
innocent housekeeper, is key in the way that the plot develops and eventually resolves
itself. Mrs. Grose, from her first introduction, is described as being a rather innocent
and stupid lady, who therefore shows that she will believe everything that the
governess, a much more intelligent woman, says to her. It is clear that the governess
uses Mrs. Grose as a collaborator in the way that she reads what she thinks is
happening, and Mrs. Grose's confidence gives her the necessary information she feels she
needs to act on her fear of Peter Quint and Miss Jessel. If you look at the beginning of
Chapter Six, it is clear that they are united together in this situation, at least from
the perspective of the governess:

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It took of course more than that particular
passage to place us together in the presence of what we had now to live with as we
could--my dreadful liability to impressions of the order so vividly exemplified, and my
companion's knowledge, henceforth--a knowledge half consternation and half
compassion--of that
liability.

After this
passage, Mrs. Grose accepts the truth of the words of the governess and, in addition,
treats her as having the "questionable privilege" of being able to see things that she
cannot. It is thus the complicity between them, and the way that Mrs. Grose aids the
governess, that helps to a large extent to create the fascinating ending of this great
ghost story.