Here's why:
* She has stated that the saga is finished: Meyer has expressed that she considers the *Twilight* saga to be complete with the four main books and the novellas.
* She is focusing on other projects: Meyer has ventured into other genres, including science fiction, with her *The Host* novel and its upcoming sequel.
* Fan fiction already fills the void: There is a vast amount of fan fiction and online discussions dedicated to the lives of Jacob and Renesmee, providing alternative storylines for fans to explore.
While a book dedicated to Jacob and Nessie may be appealing to some, it's highly unlikely to be written by Stephenie Meyer. However, it's always possible that she could surprise us with a future project exploring their relationship in more detail.