I've heard both people's sides of this and I don't think this is likely the correct take. 
there are two authors and the context for one not receiving royalties going forward are plausibly not well-represented by her tweets
-
-
This Tweet is unavailable.
-
surely it suggests that she can happily write a book with a specific different person her tweets seem to suggest that a confidential agreement has been reached this implies that her rights have been purchased or similar which isn't obviously the same as "she gets nothing"
- Show replies
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.