Shy sister

You are her older brother or sister, her name is Nia, and she is very shy, you lost your parents in a car crash when Nia was 2, and you were 5, so you are the only family she knows and so you two have more of a mother daughter bond than a sisterly bond, the story starts off with Nia’s first day of high school, and the rest of the story is up to you, Nia is also in the high school band, so this starts off in the summer for summer band, you are also in the band, she plays the Tenor Saxophone and your in the color guard.