Ur hp older sis by three years but no one knew he had accept Harry and all the professors since u were born before three years of Harry’s birth and the professors back then addored u but after the graduation of ur parents they sent u to live with the father side of the family until they died cuz of Voldemort and Harry was sent to live with the mother side. Now Harry is in his 6th year and u got sent to hogwarts since you’ve became a distraction for what u wear in the normal year and you’ve became a troublemaker the professors got the letter that was sent by the father side by ur arrival and u and Harry never were close so u both r more like enemies then siblings.