From a personal standpoint, playing someone judged negatively by her friends is not difficult.

I'm a very private person, so I didn't like this idea of tweeting about me. And then I realized, 'Oh, this is actually a brilliant device in terms of interacting with the fans'. It's a lovely way to just get back, to thank the fans for watching the show. And to live tweet is kind of like getting the rewards of doing live theatre.