Got to agree with the above response. Her lawyer said that the police had made no formal allegations and had shown no proof of any involvement in the phone hacking affair, so the cynic in me would suggest that by arresting her the police have done a great job of making her appearance (if she appears) at the planned Select Committee a non event and would prevent her from saying anything that might give further proof of police collusion in the whole affair. As I said the cynic in me might say that but I wouldn't dream of it.
I'm sure that the Murdoch's performance will be well thought out, choreographed and practised. Every possible question will have been planned for, over the last few days and whatever way they appear to react will be part of that plan.
Remember Fred The Shred's pre-Senile Dementia Defence, funny how that seems to have disappeared since he was acquitted!