Who is Emmie from Invitation to a Beheading and what is their importance?

Emmie is the twelve-year-old daughter of the prison director. She is quiet and active. She tells Cincinnatus that she will help him escape, and when Pierre's tunnel leads Cincinnatus out of the prison instead of back to his cell, Emmie meets him outside. However, she leads him back to the prison director's home. Her escapade is put down to a last trick to play on her father before she goes back to school.