to concede defeat and issue a definitive statement of facts and a full mea culpa?
I don't think so. I think they would all just stay quiet. Raymoth would disappear and live in rural isolated comfort at home or abroad on the past earnings. The only thing I could possibly see happening, if undeniable proof appeared of something like the 2 year/2 months terminal diagnosis being faked*, is that the agent would drop her, the publishers would allow the 3 books to go out of print and not distribute the 4th one, with a statement being issued perhaps of having acted in good faith after been assured by the author that her writing was a true account.
At this stage however, I'm not so sure that she is still in the game. All the negative publicity about her embezzlement, all the doubts raised about the severity of Timmoth's diagnosis, about the real reason behind their (alleged) homelessness and setting off on the walk, even about the walk itself, the charity dropping them, the stories of ordinary people feeling harmed? Can she really come back from a solid month of that?
*Some might say there is already proof of that?