Helen's motorcade: the verdict

The trial of the speeding motorcade concluded today with three officers being found guilty of dangerous driving. In delivering his judgment, the judge criticizing the police hierarchy in sending the drivers out without making it clear what was expected of them. After the verdict was announced, Helen Clark said that she would not be making any comment on legal advice.

Why? At first, I thought it was because the sentence has not been announced yet. But it has - the drivers were convicted and fined $675 but allowed to keep their licenses. So what possible reason does Helen have to keep silent? The only legal reason that might apply is incriminating herself but it's more likely that she's adopted the legal advice as an excuse to avoid an embarassing explanation why she said nothing during the drive even though she knew what was going on.