Rose smiled, genuine amusement and warmth in it. "It's not always easy, but I'm doing better now that I can travel again. Those three centuries living day by day on Earth were the hardest."
She chuckled, her gaze searching his face again, though she wasn't sure what she was looking for. "And the hardest part isn't that I can't die, but that I know I can't get back to the Doctor, or you, not without ripping apart two universes. Not after I leave here, if there's even a way to leave."