Who is Kristy Palmetto from The Truth About Forever and what is their importance?

Kristy Palmetto is described as an outgoing, fun-loving teenager, who like Macy, works at Wish Catering. Her face was badly scarred in a car accident that occurred when she was 12, but those who meet her quickly forget about the scars in favor of her charming, quirky personality. Kristy lives with her grandmother and sister because her mother left the family after causing the accident while driving drunk.