Friends at last

This story is about a girl named Agatha Piers,not just any little girl though, Agatha is an 11 year old wizard who doesn't find out until the day comes, that day happens to be the 1st of September. As the many days,weeks,months before that she lived with her parents. Her parents adopted her when she was 1 years old at a strange adoption center, but they didn't think much of it 11 years later she discovered herself at a giant castle named hogwarts.