Yes. She's part of an elabourate plot to make him doubt her existence.

"I left last night," she corrects gently. "And now I'm back."

You know, that old notion to pet his head never entirely left her--it just buried itself in her subconscious, waiting to jump out into her brain like a trapdoor spider.

And this time, she does it, lightly stroking his hair back from his forehead.