The narrator's attitude seems to have changed. Do you think she will get better?

Yes, by the end of the story, her attitude has changed. She's slinking around their summerhouse like some sort neurotic ghost. As long as old Johnny boy is in the mix, I don't think she can get better. John is really a representation of the whole patriarchal system that existed then. A woman had to conform within the superficial parameters of feminine identity at the time of suffer complete loss of self.