Dear Deadly Sister| A Percy Jackson Fanfiction

there's a girl who was born and raised it Tatarus (literal hell) and she was trained to be her masters (will be named in the book)most feared and deadly assassin, raised to hate the gods and everything they did, well she gets sent to Camp half blood and finds that shes the sister of the person shes here to kill. later, after she has an awakening of some sort, she finds that shes been working on the wrong side the whole time so shes going to try and make things right with her family, and she tries to be good....but will she succeed?