!Steal my ideas and your dead!

What if Edward had a little sister in his human time. He thought she died from a gun shot, that he accidently shot her when a vampire came near her when he was hunting in the woods. What happens if she came back to life as a vampire and a special one at that. What will edward do if he found out she's alive? What if a certain vampire falls for her and becomes her mate?* Eclipse Movie*