Sarcasm is an adjusted stress reaction.

I'm not sure she's aware of the Time war. Wasn't she back in the amphitheater when he gave his huge ranty speech? She had to rush back to the temple on the flying moped to save the day, so I'm not sure if his voice (pointed away from her) would have carried.

The grandfather comment was interesting, though...I'm guessing we'll be seeing more little bits and asides like that as the 50th anniversary draws nearer.