The queen doesn't have any resistances or immunities, it's just regenerating 5 a turn. That's really all it does. Plus, Non-lethal damage, the kind Emiko's throwing around, requires her to deal a total of her<em>Maximum</em>hitpoints in damage for it to work. So, Emiko's effectively trying to solo the boss lol. I know there's not much else she can do, but even attacking with her bow would probably be more effective.