Margaret Peterson Haddix 
Just Ella [EPUB ebook] 

Being a princess isn’t all that….You’ve heard the fairytale: a glass slipper, Prince Charming, happily ever after… Welcome to reality: royal genealogy lessons, needlepoint, acting like "a proper lady, " and — worst of all — a prince who is not the least bit interesting, and certainly not charming. As soon-to-be princess Ella deals with her newfound status, she comes to realize she is not "your majesty" material. But breaking off a royal engagement is no easy feat, especially when you’re crushing on another boy in the palace…. For Ella to escape, it will take intelligence, determination, and spunk — and no ladylike behavior allowed.