You’re Snape’s daughter. You got your letter when you turned 11 just like you were hoping for but your father, Severus Snape, kept you home because he felt that Hogwarts was not safe. He would have you study so you didn’t get behind

After a few years, Snape eventually lets you go. He doesn’t feel like the school is any safer but he can’t take your pleading anymore

The new school year arrives and you get on the train. You have everything you need, just happy to be able to go now