Is that you, Lady Maria? No, you're someone else. Please, could you do something for me? I need Brain Fluid. Murky, mushy Brain Fluid.
After giving one Brain Fluid
Oh, thank you, you're terribly kind. Ohh, it's wonderful. And, oh! I hear the sticky sound. Do you hear it, too? Oh, I know. Will you have my blood, as thanks? I'll have you know, I was once a Blood Saint, too.
She drops the Balcony Key if killed. But killing her stops her questline, as such it is not reccomended to do so.