You have asked for his advice about two matters which concern you very deeply, and although he knows your love for this Holy Cause will assist you in making the right decisions, he knows it will be hard for you to do so, and therefore assures you of his loving prayers that you may take these steps courageously, and that the way may be made easy for you.
He has heard nothing against the character of Mrs ... and does not doubt in many ways she may be a very commendable woman. However, this does not change the fact that in view of her inhered convictions about Bahá'u'lláh it is best for the Bahá'ís, including yourself, not to associate with her. That which is in the heart of those who have actively opposed the Manifestation of God is spiritually unhealthy, and although we in our limited human understanding cannot always see the wisdom of shunning them, the Master has instructed us to do so, and for our good, and the good of the Cause, we must obey this instruction.
The matter of your giving up your church membership is a conscientious obligation. He does not force you to do so, but as you no longer believe in all the doctrines of your former church, to continue to be a member of it is really to put yourself in a position of one who is acting insincerely. Should you decide to withdraw from the church as a member, however there is no reason why you should not continue to go to church with your husband, and to continue your friendly association with the congregation. He will pray that your husband may be willing for you to take this step.