Publishers pay out only part of advance at the time contract with author is signed. Perhaps 25% - 50%, which is a ton of money in this case. There's always contract language that specifies date manuscript is due. In most contracts, publishers reserve the right to cancel the book prior to publication. In Hitlery's contract, these paragraphs might be written in a very interesting way that manages to just give her the money, a legal way for publisher to make excessive campaign contribution. However, the tax man will undoubtedly straighten that out. If Hitlery's popularity continues to decline in double digits, publisher is well within its rights to cancel the book and perhaps to demand advance monies back, depending on language in contract.
A few years ago, a publisher asked actress Joan Collins for return of advance money, a least a million bucks. Collins had turned in an "unacceptable" manuscript, which they bounced back to her. Collins sued the publisher, won, and kept the advance.
I'd love to see Hitlery getting into a hissing contest with her publishing house....it would make wonderful reading in the National Enquirer. Which is where she and Bill and that ugly Chelsea belong.