I think so! I must admit, she's been a whole lot better so far this week, so I think something must have stuck. We were talking about her dogs on the Nintendo game and I asked her if she thought I had given her a fair punishment. She said yes, she did think that and realises that shouting is not going to get her anywhere.
On discussion with colleagues at work, it seems that girls would appear to be more trying than boys on the whole (especially with their mothers!)