"It's been pretty emotionally draining. Just all the stuff when she was crying and she doesn't know why she's crying - that was quite a challenge. But I think there's a lot more to come in the next series. I really want to just keep on developing her character and I want her to evolve and change lots."
"I think that she's a completely different person at the end of the series to when we meet her, when she's really quite odd and a bit messed up in the first episode. . . . I think she's much more kind of in tune with what she understands about herself mostly and the Doctor by the end of the series. And she's been through a lot in the series."