Basically, she is going to claim this is ‘wiretapping’ and is illegal, even to expose criminals, without a court order.
And I would argue that this was a criminal activity in a public place where there was absolutely no expectation of privacy. I can see protecting people from a wiretap or video of where such an expectation exists, but this is an organization that takes public money and whose doors are open to the public. The general rule should be that if you expect to be able to change your clothes without being recorded then you have an expectation of privacy. Otherwise...all bets are off.