1. "The Hunger Games" series by Suzanne Collins: A thrilling dystopian adventure suitable for teens, focusing on bravery, determination, and survival.
2. "Harry Potter" series by J.K. Rowling: A classic magical adventure series beloved by many, suitable for readers of various ages, including 13 year olds.
3. "Divergent" series by Veronica Roth: Another dystopian series, exploring themes of identity, choice, and the search for true individuality.
4. "Wonder" by R.J. Palacio: A heartwarming and thought-provoking story about kindness, compassion, and acceptance, told from the perspective of a boy with a facial deformity.
5. "The Giver" by Lois Lowry: A poignant and introspective novel exploring the concept of a seemingly perfect society where individuality and emotions are suppressed.
6. "Holes" by Louis Sachar: A humorous and adventurous read, blending mystery, friendship, and personal growth as main character Stanley is sent to Camp Green Lake for a crime he didn't commit.
7. "Eragon" series by Christopher Paolini: A sweeping and epic fantasy adventure series focused on dragons, elves, and battles between good and evil.
8. "Maze Runner" series by James Dashner: A thrilling and immersive dystopian series, filled with action, intrigue, and the journey to restore memory and uncover the truth.
9. "To Kill a Mockingbird" by Harper Lee: A literary classic, dealing with topics of racism, social inequality, and empathy through the eyes of a young girl.
10. "Artemis Fowl" series by Eoin Colfer: A fun-filled fantasy series featuring a teenage criminal mastermind whose adventures get tangled with magical elements.
Consider your sister's reading preferences, interests, and maturity level when making your final selection.