She claims to have signed contracts for two books: the political one and another cookbook.I'm interested in this too - as her books are how she earns a living. She had a 2-book deal, which expired with the last one. Then, after her Edinburgh trip, she manically tweeted her agent (literary agent) that she had an "idea". My personal view is that she hasn't been given an advance - her agent might have asked her to write a synopsis and pitch it as a possibility. And in Jack's mind that turns into writing her latest opus.
The margins on books now are not what they were. A lot of people bought Jack's first book. All the others have sold less and less. Someone posted an article that said something like 75% of her entire books sales were just for the first one. So it's a downward path. If she is trying to write a poverty memoir it will be a mess - she'll quote Guardian articles and statistics out of context, she'll exaggerate her own personal story, etc. Why would a publisher go near her?
(Both contracts were signed after coronavirus started, for anyone keeping track of her "lost earnings")