Does a divorce take place if the wife says: "You are forbidden to me and I am forbidden to you if I do such and such," and does a divorce take place if the husband divorces his wife while she is menstruating without knowing the ruling on divorce during menstruation, and what are the consequences if the wife breaks her oath?

You have pronounced two divorces upon your wife, and you may take her back before her iddah (waiting period) expires. As for her oath by making something unlawful (al-haram), it is an oath whose expiation is the expiation for an oath when broken, and no divorce occurs by it. She has indeed broken it. It is necessary to avoid such oaths due to the distress and difficulty they may lead to.