The Girl Who Was Concealed

Harley Torrance's parents died in a "home invasion" when she was three. She was adopted by a nice couple and things seemed well...until she was four and started performing magic. For ten years she remained under the radar until she concocts a potion to get revenge on a bully when she is fourteen.
It is then that a Concealment Charm is lifted from her and she gets two visitors at her home: Albus Dumbledore and Rubeus Hagrid. Harley is a witch, and she is about to embark on a deadly, heart-breaking journey alongside the most famous and infamous students and staff at Hogwarts School Of Witchcraft And Wizardry.

(Takes place starting with "Chamber Of Secrets" and through post-canon.)