So far we have seen Ana Lucia kill the guy who shot her, Goodwin and Shannon (and I still assign Nathan's death to her). She is starting to border on serial killer territory here - can you say Rage-aholic?. But she is in good company as;
Jack killed the Air Marshall
Sawyer killed the Shrimp Guy (and one of the Polar Bears that could have eaten her)
Charlie killed Ethan
Kate killed her Daddy
Locke killed Boone (sort of)
Walt killed that bird
Who knows how many people Sayid has killed
Hurley's cursed numbers killed his Grampa
Hey, she should fit right in with this merry band of murderers we love so much. But really, good manners dictate that she should have attended Shannon's funeral. Locke sucked it up, Jack buried the Air Marshall.