Everything's crystal clear

Jack and Elsa had to give up being a part of their daughter, Crystal's life in order to protect her from Pitch. She grew up with Kristoff and Anna knowing about her powers but not her real parents.what happens when Crystal turns 18 and finds two books with the title 'The ice queen' and 'Jack Frost? will she be found by Pitch? Will Jack and Elsa be able to protect their daughter?