She never expected things to get this uncomfortable. Yes, she's roughed it in bad weather before, but that's because she was prepared for it. Being nearly naked against cold stone is not something she is adapted to in the least. After suffering for a while she realizes that not only would she not be able to sleep like this, but there was a very real possibility of getting sick or worse if she stayed like this. So finally she gets up and moves over to the ettin, settling down against him while trying not to disturb him at all. She hopes he doesn' take exception to this, but she definitely could use the warmth.