In that case she should be sacked because he was only under suspicion at that time.
She told the club what he was accused of nothing more, don't even need to read the link.
She told the club he had messaged and kissed the girl, because he had himself admitted to that in his interview when he was arrested. It was not "speculation" at that point and it was not "an allegation". He had admitted it, and that was communicated to the club.