Doctor Who: 14 Cool Details In Steven Moffat & David Tennant's Silence In The Library Commentary
9. The "Ruthless" Way That Director Euros Lyn Made Eve Newton Cry
Young Charlotte Lux is played by Eve Newton, who, according to her IMDB page, hasn't done any more acting work since appearing in Doctor Who - and that might be because she was completely traumatised by director Euros Lyn's approach to making her cry.
According to Gardner, Lyn was utterly "ruthless". He would whisper to Newton about "the saddest things, and people dying, and losing people" in order to get Newton to show the right amount of emotion during her crying scenes. Poor kid.
According to Tennant, this was also the first time that Newton had cried on camera, which must've made the whole situation even more difficult.