well... I'm beginner
I really like the expression. Positively murderous but in a sane way that reflects her being a former psychiatrist and having a lot more to her just being crazy enough to get into the stuff she does.
That is absolutely a look that will kill -- cannot understand why the Lady even bothers to pack a pistol when she can o you in with her eyes. Probably pumps a lot of slugs into you post mortem so they don;t discover her real weapon.