Who is Pearl from This Boy's Life and what is their importance?

Pearl is Dwight's youngest daughter. She is unattractive and has a bald spot in the middle of her head. Pearl is a tattletale who constantly looks over Toby's shoulder. Pearl is desperate for attention and loves Rosemary because she pays attention to her and treats her kindly. Pearl is extremely competitive and strives to win games because people pay attention to her when she wins.