Elle was popping her neck when her sister looked at her and then she used her thumb to swip across it as to say death. She then stepped closer to Sylar, "Let her go, what do you want with her anyways, she nothing, just the weaker twin of me, why need a double when I'm right here."
Yes, she was trying to get V free, she just didn't need her sister to get mixed up in her past mistakes.