Good point Tess. Maybe she was left behind, and wanted back at the beach, who knows, the Others become more an more confusing as time goes on, and now to have my beloved Locke in their fold, they are mysterious and dangerous.
My only question about all this is, Smokey seemed to scan all of the Losties the first night!, and left most of them alone. He knows they are their by accident, or riding the coattails of someone else on the plane, and has left them be. Or he can't go on the beach himself, or he just wants to kill the others so bad, he doesn't give a crap about the losties... yet. so which is it?