Ellie’s mistakes are further evidence of her inexperience. She is jumpy and not thinking clearly, even though she obviously knows what to do, evidenced by the fact that she ultimately pulls the emergency brake. Still, the girls can’t be swayed in their determination to pull off their plan. Even after the scare with the patrol and Ellie nearly crashing the truck, they are still willing to go through with it, which again reflects their growing maturity.