As posted on another thread:
I Just got an interesting piece of potential info from a friend at the USTA that might explain Serena's (and Venus's) reaction to PMac's invitation to comment on the revised statement on Serena's blog. Apparently, Serena not only hadn't written the revised statement by herself, but hadn't even read it yet when PMac asked her to comment on it. It was supposedly created by her publicist and posted for damage control, but Serena had been too busy/occupied to review it before the match (as you might expect when preparing for a Slam final). So when PMac asked about it, apparently Serena may have avoided the question (with Venus's assistance) because she didn't know exactly what it said, and didn't want it to become obvious that she didn't know specifically what "her" words were.
I need to make clear that I got this info from someone else, so I'm not saying I know it to be true...just passing on what I was told. However, he is typically a reliable source.