She's thinking through mud, and by the time she realizes he's made a joke it's too late to laugh even if she could. She tries to nod, but it ends up being one half-hearted jerk of her head.

Everything is dull and numb.

(Everything but the madness inside her heart.)

She wants to roll away, but she doesn't have it in her to struggle against him. She was fighting for her life, and now that she's awake she can't figure out why it was so worth fighting for.