Andrew Chambliss and Kalinda Vazquez, the writer of the episode 4×06 of Once Upon A Time, said that they loved Elizabeth’s performance as the Snow Queen. Take a look at this video from commentary they did for the bluray.
Well, it’s impossible not to love her performance. Everything was perfect! The scenes with Robert Carlyle were amazing, but you know, she was brilliant in all of them, even when she was alone. Elizabeth did such flawless job with this character! We wish we could see more scene with her! She is mesmerizing!