Peace by Piece

When fourteen-year-old Hannah arrives in the ninth grade in the middle of the school year, the students quickly realize that she is not like everyone else. One of her classmates, Cyndy, becomes curious about Hannah's strange behavior, her short memory, and her even shorter temper. Little by little, the two girls become friends. Cyndy helps Hannah with a Social Studies project. When Hannah delivers her presentation, the story she tells shocks everyone.
How did Hannah's story affect her classmates?
What did they do to help her?