Is the wife's request for divorce considered forbidden, or reprehensible, or a cause for accountability, if her marriage took place without the knowledge of the first wife, and the disclosure of the matter led the first wife to request a divorce, which may lead to the disintegration of the husband's family?

You are not to seek a divorce merely because you do not wish for your husband's first household to be разрушен (destroyed), for the husband is more knowledgeable of his own interests. The first wife does not have the right to demand a divorce merely because her husband married another. The husband must grant the second wife her right to stay overnight, and she may, with her consent, cede her turn to the first wife.