I'd be surprised if she said anything, it does seem like there was a bit of a clique/inner circle on his shows who were/are genuine friends with Whedon, would regularly go round to his house for dinner and to do Shakespeare readings etc. With that in mind I wouldn't expect to see statements from Hannigan and Alexis Denisof, Amy Acker, the majority of the Firefly cast etc. I'd love to be wrong on this though!
In fact the main bit of evidence behind a lot of the rumours about SMG being a diva on set at the time actually seemed to centre around her NOT being part of this clique, and (shock horror) treating her co-stars as co-workers rather than her best friends