Is it permissible to supplicate for the guidance of a married Christian woman and to supplicate for marriage to her after her conversion to Islam and her divorce, and is this supplication considered an transgression and a sin, and does it fall under the Hadith: "The supplication of a servant will continue to be answered as long as he does not pray for a sin or for the severance of kinship ties"?

The fatwa you referred to on our website has no relation to your question, nor is there any contradiction between its answer and the answer to your question. The intent of the person who answered you, saying, "We fear that your supplication might be an transgression," was referring to your supplication that she become your wife, whether you supplicated this along with supplicating for her conversion to Islam or afterwards, as long as she is married.

Your supplication for her conversion to Islam, or your inviting her to Islam, presents no problem. However, your supplication to marry her necessitates her separation from her husband. Her conversion to Islam does not always necessitate her separation from her husband. If he converts with her, or converts before the expiration of her waiting period (iddah), she remains under his marital bond. Thus, your supplication to marry her is as if you are supplicating for her husband to remain in disbelief, or to die! This is a clear transgression. For this reason, the answerer guided you that if you truly desire good, you should supplicate for her and her husband to be guided, so that they both embrace Islam together.