If you look at the chairs it's the same chair. What if Jenny crash landed on the Dalek asylum and the fall caused her to regenerate? Also, since she is a Time Lord, what if she somehow figured out how to time travel?
Dialogue from season one. That Look Nine has when he's talking to Jackie but looking at Rose. All of the human race at stake, and she understands it. And he realizes just how brave she is. And for a moment, that bravery keeps both of them going.
*Looks at pic* Shut up. *Reads dialogue* You, shut up as well. *The Doctor's face close up* Will you all, please, just leave me alone – I can't do that anymore, I promised! (I'm off Doctor Who for exam purposes.