From the article, I understood it as tying in with "clinging to the plot as [she] first imagined it" - i.e., the "wish" involved is the desire to stick with the ideal of her original conception of the story.
I could easily be wrong about that, but it's the least stretch from the provided information that I can come up with.
I could easily be wrong about that, but it's the least stretch from the provided information that I can come up with.