Kall is abroad, and although she can reclaim his new identity, it becomes a problem if she has to hire another hitman overseas to kill him. On top of that, Kall is wanted by the FBI, which makes things even more complicated, because Liliane has no desire to get involved with the FBI.
She wants him to settle their scores once and for all without dragging anyone else into it, since both of them have suffered from the loss of their loved ones.