let the TARDIS die. Just let this old box gather dust. No one can open it, no one will even notice it. Let it become a strange little thing standing on a street corner. And over the years, the world will move on, and the box will be buried.
She refers to him as "her thief." The TARDIS was amazing as a human using her temporary voice to tell him what he means to her. She was smart and brilliant: "I wanted to see the universe so I stole a Time Lord and ran away.