think J.A. had not ok:ed her last book was a passage from The World of Her Novels.

"For though in composition she was equally rapid and correct, yet an invincible distrust in her own judgement induced her to withhold her works from the public, till time and many perusals had satisfied her that the charm of recent composition was dissolved".(Henry Austen quoted)
It is Ms Le Faye's belief that this was why both Northanger Abbey and Persuasion ended up being published posthumously, with titles probably chosen by Henry. There was a family tradition that Jane had referred to her last book as 'The Elliots'.
Was it while she waited for that charm to vanish that she wrote the twelve chapters of Sanditon. Or else how come they were not offered to be published?