The Opposite Triplets and the Criminal

At the age of seven, Lucy discovered her parents laying in bed...Only they'd been murdered. They were taken in by a dark wizard who influenced her twin brother and twin sister to join him but Lucy resisted. On the run and afraid, she trains with the many keys she has and soon becomes one of the most desired freelance criminals in Fiore. When she'd discovered by Fairy Tail, what will happen? And will she be able to dispose of her siblings or will she crumble under the pressure.