All familiarity, those mannerisms... Clara felt a sharp pain in the center of her chest. It wasn't unlike the way she felt when she watched the TARDIS dematerialize when she'd lied to him about Danny coming back. Or unlike the pang of emotion when she'd tried to get him to use the TARDIS to go back in time to save Danny. Do you think that I care for you so little that betraying me would make a difference? That was the bond they had, and now he looked at her without so much of an inkling of recognition.
Oh sure, he remember the Diner Girl, much the way his previous incarnation kept calling her the Impossible Girl. This was different, and Clara wished she had her TARDIS so she could run away from it.
Instead, she took a sip of her coffee. "What am I supposed to do? Scream? Cry? Demand to be sent home? I've seen others doing just that. If it didn't work for them, then why should I?" Another sip. "Besides, we're in a giant space head. How many people can say they've done that? Nah, I'm going to get as much adventure out of this as I can."