[She holds back the near immediate scoff-- what warden aside from Sentience has been so considerate?-- only out of thought for him. He's trying to be positive, however forced and false it might possibly be, she can't demean his efforts. She should be supportive.
So she flashes him a thin yet reassuring smile, both to convey a hopefulness for that farfetched wish and as a 'see you in a bit']
...Maybe.
[She'd ask what he would want but for the fact she thinks she already knows. If Saya was only asleep, if she hadn't gotten him... someone to end her life as she wished, then she could be with the others...]