Who is Elisa from Jumping the Nail and what is their importance?

Elisa is Dru's best friend. She struggles with depression. She should be visiting a doctor regularly and taking her medication, but she stops. She says Scooter makes everything okay. Scooter is her new boyfriend, who is popular. He convinces her to jump the Nail and they do. Elisa has a mental breakdown in which she thinks she saw a drowned girl in a car underwater who speaks to her. Elisa's mental state is fragile, but she will do anything for Scooter, who controls her. Elisa struggles to keep her sanity, but she keeps losing her grasp on reality.