Reincarnated as the Author's Background character self insert

A famous author dies before publishing her final book of her famous series "The prophesied reflection" She finds out she has been reincarnated as one of her self insert background characters she made and wants nothing more than to win the heart of one of her favourite characters, The Mad Prince's Most trusted General and Older Sibling, and rightful Heir to the Thrown, The necromancer Princess who is slated to sacrifice herself to protect her brother and the Main character in the final battle against fate itself. Will she complete her goal,will she die, will she give up and admire from afar find out next time in RATABCSI!!!!!!