Where you said:

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".....Mr. Knightly is right...Emma is not a suitable companion for someone like Harriet, who is definitely even more susceptible to foolish ideas of romance than Emma herself!"
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This is an excellent point that deserves to be highlighted. Sort of "the blind leading the blind."

This is why I glommed onto Emma so strongly....the comic-relief lies in the reigning confusion as offered up in larges doses by Emma! The poor first reader is probably asking "what on earth can possibly happen next?" Just wait and see because the fun is just getting started.