Young Adult; Coming of Age
Actually, this is a middle-grade novel, but that's close enough to young adult—it's aimed at tweens and younger teens, and told by an eighth grader. As for the coming-of-age thing, we see Corinna get her first bra, wait anxiously for her period, and experience her first kiss—all without her mom's support. Plus, at the end of the book, she starts high school. Corinna's learning what it means to be a teenager and how to hack it on her own without her mom, and we're along for the ride as she finds her footing and starts to come into her new normal.