Her Royal Highness by Rachel Hawkins

Just when she thought things were finally moving in the relationship direction, Millie Quint finds her best friend/almost girlfriend kissing someone else. Faced with spending her senior year in a completely awkward place, Millie decides to apply to boarding school… in Scotland. Where her roommate turns out to be an actual princess.

An enemy-to-lovers, will-they-won’t-they story with the added benefits of rebel royal teenagers and beautiful Scottish scenery. Will Millie and Princess Flora find love at boarding school, or will they kill each other during a school-wide camping challenge? If you’re looking for an easy, fun read and you loved Red, White and Royal Blue, this is the book for you!