I'm thinking Lena for her name
She is the other girl's best friend and the most beautiful girl in school.
She wears wigs because she had cancer and lost all of her hair due to chemo... She got made fun of at her old school and that's why she moved. She beat the cancer but for some reason, her hair never grew back.
Her father is a doctor and loves his daughter very much.
She's beautiful, smart, and kind. She looks innocent but if you mess with her loved ones, she'll come after ya!