Smiling back, sympathetically, she reaches out to squeeze Donna shoulder gently, before her hand retreats again. They don't know each other that well yet, true, but she can guess from previous conversations how close she and the Doctor had been. Losing someone is losing someone.

"Nothing that didn't grow back," she replies. Making it sound more like a joke than anything else, even if it's the truth. "I'm glad you were all right."