In answer to the questions I think it is easy for all to say she doesn't need to know. But since they were not divorced until long after the sin it would seem at the time she should have known. Also, it appears nothing was done. And I think it just makes her feel that where was the church for her. He does not provide all the financial support mandated in the divorce either. And what about the ordinaces for the child that will be done in the future. Shouldn't she know if he is not to give blessings and perform ordinances? He did participate in ordinances already when he was not supposed to.
This is not meant to bring negative comments toward the church or anything of the sort. Just a question on if this is policy or a case by case basis?