Magic?

Olive Whitlock's life has been turned upside down when she's thrust into the world of magic as a 5th year at Hogwarts. Suddenly she faces more danger than the cruelty of the orphanage matron, with her ability to see a rare ancient magic she finds herself being hunted by dark wizards and goblins in her pursuit to finish the keepers trials. Along the way she makes friends with a pair of Slytherin boys who make her question if she's doing the right thing.

Posted first on AO3