"I told you," she snapped, not even trying to hide her anger. "I am trapped. I do not want to be here. I came only to see what you were doing and now I cannot leave."

Why was he so difficult? Why was he so annoying? Why was he--

--holding her key?

"Do you truly not believe I am the TARDIS?" she asked, her voice slightly less angry. "I ran from you, but I never thought you would run from me."