That's a somewhat startling admission, and the TARDIS frowns slightly at them both, though it also makes Cosima more trustworthy (not that she had doubted the girl). "I am sorry to hear it," she says sincerely, but doesn't linger on the topic.

"I am a space and time ship. This isn't my true form, only the one I take to communicate with others." She's quite curious to see how excited the girl is going to get about that. "My pilot is called the Doctor."