Well, I think by the time she got to Gaudy Night, she may have been resigned to the fact that she wasn't going to be able to avoid creating great literature while resolving her characters' situation, unless she wanted to fudge unconscionably. But you can, I think, sort of seeing her having no clue what to do in between, including writing an entire (and also extremely good) Wimsey mystery with only a single oblique reference to Harriet at all.