She will erroneously confuse players with Lady Maria, but soon understands her mistake. Then she will beg her new acquaintance to fetch her Brain Fluid, something that will allow her to keep her focus on a "sound" she hears.
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 first 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.
Refusing or Accepting Blood
Oh, I'm sorry... Do come back if it please you. I am in your debt.
That makes me happy. But I cannot move. Look, on my right arm. I'm sorry to trouble you, but you don't mind, do you?
Talking after accepting blood
Oh, there you are. Don't be greedy. As they say, "Fear the thirst for blood." I should know. I was once a Blood Saint, too.
Talking after consuming Blood of Adeline
Oh, there you are. How did you find my blood? A touch more? Should it please you...
Talking without Blood of Adeline consumed
Oh, hello again... I'm very sorry. As I was a Blood Saint, I cannot break the tenets of the Church, even for you... Once you've run out of blood, come visit me again.
Hello, hello, is anyone there? Please, somebody, I need help. I'm trying, but I'm afraid the sound is fading...
Hello? Is that who I think it is? Please, oh please, I need Brain Fluid. The sticky sound is fading fast. Please, bring me Brain Fluid. I must have it... that sound, it is all that guides me... Without it, I'll be sent back... To my former, lesser years...
She drops the Balcony Key if killed. But killing her stops her questline, as such it is not recommended to do so.
She addresses the player as Lady Maria when first spoken to, but quickly realizes it isn't her.
Curiously enough, Adeline seems to have a head that isn't as pinkish as the other Clocktower Patients, but rather a slightly blueish one.
Another curious thing is that unlike the other "head-only" patients, her body is nowhere to be found. It would make sense for it to be strapped on the chair at the very least, but it is not there. It's as if her body was devoured or absorbed by her own head.