Key to the Lock (Harry Potter Fanfic)

Ava Thornwood didn't know much about her life as a child. Being told her parents and elder brother died due to You-Know-Who, she was left under the care of a muggle family. Years later Ava gotten a letter to Hogwarts and was seated into Gryffindor she easily became friends with the well known trio, and even starts getting feelings for the one with the lightning scar ,but after being spotted by sneaky Draco Malfoy, Ava gets a change if heart. Should she go to the dark side, or resit her temptations?