The way he ignores her question speaks volumes. She may not know what happened to the TARDIS but she knows something did. And he survived. It's a relief that makes the panic die down. He's broken and not right but he's alive.

"Oi, you found the laundromat then?" she says as she steps through the door with a smile that's a little more forced than usual. She wants to hug him and hold him and let him know he's not alone anymore. Instead she keeps her hands firmly tucked in her pockets and the smile fixed on her face.