When I was that age I read a lot! These were some of my absolute favorite books:
Books by Karen Cushman (Like The Midwife’s Apprentice, The Ballad of Lucy Whipple, and Catherine Called Birdy).
Books by Elizabeth George Speare (Like Calico Captive, The Bronze Bow, and The Witch of Blackbird Pond.)
Books by Gail Carson Levine (Like Ella Enchanted and The Two Princesses of Bamarre).
Others that I adored were Johnny Tremain, by Esther Forbes, The Door in The Wall, by Marguerite de Angeli, and Beorn the Proud, by Madeleine Polland.
I read all these books over and over again when I was in my early teens. They’re all totally worn out on my bookshelf! I know that once my own little sister gets old enough, I’m definitely going to have her read all these.