In mine, it would be grounds for libel most likely even if she can prove it in court, as far as I understand law. Or rather, the point is that she can't prove it fast enough for it not be libel (proof has to be produced within ten days, and in this case, proof would be a judgement against the guy).

And I have to say that seems perfectly reasonable to me, as public accusations outside the justice system are something I really disapprove of.