In a fit of anger, she had tortured Luna, used multiple bone-breaker curses, but it all turned in her favor, as the airy head Loony Lovegood couldn't stop admiring the beautiful couple that Harry and Hermione would make, it was all too much for Ginny to see her potential husband and gold mine slipping away into the prim and perfect Hermione's claws. Once she realized that she had tortured her it was necessary to remove Loony and what perfect opportunity, as Hermione was skipping down the stairs as the stairs turned towards the 3rd floor. She hid in an alcove and screamed for help. As a prefect, Hermione had to respond, and reached the end of the corridor, where she saw Luna's unconscious and tortured body. Just as she bent down, unaware of the presence behind her, a stunner hit her in the back. Ginny picked the fallen wand and used it to fire a Diffindo at Luna's neck. Although she knew it was wrong to take a life, she couldn't let her dreams be shattered because of a Muggleborn upstart. And then it was her life or Luna's, she chose her own, so Luna had to go, if it took Hermione out of the equation, all the better. She placed the wand back and then ran back to McGonagall with her sob story. And then everything fell into place. Slowly, comforting Harry and poisoning his mind against her, she clawed her way into his affections and pretty much secured the title of Lady Potter for herself.