My kid just turned thirteen and we’ve had a lot of success with authors who write for that middle ground between middle grade and YA. Kate O’Hearn’s books, like 'The Sky Thief', have adventurous plots with a sweet, slow-burning crush element that doesn’t go too far for my comfort. They focus on friendship and loyalty first, which I think is a great foundation. Another one that gets recommended a lot, and for good reason, is 'The Lions of Little Rock' by Kristin Levine. It’s historical fiction set during school integration, and the central friendship between the two girls is so tender and meaningful—it’s about a different kind of love, really, the love of a friend who sees you. For something more contemporary and funny, 'From the Notebooks of a Middle School Princess' by Meg Cabot is pure joy. It’s a modern spin on 'The Princess Diaries' for a slightly younger audience, and the romance is very innocent and celebratory.
I’d be careful with a lot of popular YA romance right now. So much of it is very intense, with mature themes or a ton of angst. At thirteen, they’re often still figuring out their own emotions, and a book where the main conflict is miscommunication or jealousy can feel stressful instead of fun. Look for stories where the romantic subplot supports a larger journey of self-discovery. 'The Secret of a Heart Note' by Stacey Lee is a perfect example—it’s about a girl who makes perfumes that can inspire love, and the romance that blooms is charming and tied to her learning about her own gifts and choices.