[Her face softens at the exasperated noise.]

I am sorry. If I knew how to help with nightmares I would.

Perhaps try reading before you go to sleep?

...And if you wish to tell me about them, I will be here.

[She's pretty sure you won't want to. She's the reason why you're like this after all. Well one of the reasons. But at the same time, she feels she has to make sure Eleanor knows that she is available to talk to.]