She is giving Narcisse false information, and you see how cold and distant she is with him, I don't think she is fond of him much. That sick ritual of cleaning that scar on this chest is too uncouth.
Narcisse is saying her mom deserved to die and Chalky was like
when he heard her mom was bodied. She's setting up a trap for Narcisse, no way she sides with Narcisse, especially since she hasn't been able to shake him after all this time.
This story line is pretty cheesy, but I get to see Chalky in action so I can't complain.