Anna had no interest in letting Castiel out of her sight anytime soon. She'd just found him again and the fear that she would blink and he'd be gone was still there. It would abate with time, but for now she was sticking close to him.
Of course, she would have done that anyway considering the circumstances. They still didn't know how they'd been transported to this place or why, which meant that they also didn't know everything that could pose a threat.
She gave Castiel's hand a brief reassuring squeeze once they entered the room. Social situations still weren't his comfort zone and she was perfectly happy to act as both support and a buffer if needed.
Mostly, she spent her time silently cataloging those in the room, trying to place the faces that she might know and listening to the conversations around them. It was an odd mix of people, that much was certain.