I need help finding a book I read years ago. This book is about a heroine whose heart was taken by a witch to save her life after an accident that killed her family. The witch sends her to a kingdom to befriend the prince in order to eventually take his heart. To have the prince trust her she becomes part of this thing where some different woman will try and become close to the prince so he will chose her to become his wife. The title has heart in it. And I can’t for the life of me remember it.