What is the 'iddah (waiting period) for a divorced woman who requested the divorce and whose divorce was finalized on 15/10/1434 AH, and who experienced her first menstruation on the very day of the divorce?

The waiting period (iddah) begins from the issuance of the divorce. The iddah of a woman who seeks khul' (divorce at the wife's instance, usually for compensation) is the same as that of a divorced woman, according to the majority of scholars, who base their view on the Almighty's saying: "And divorced women shall wait by themselves for three periods." The menstrual period occurring after the divorce is counted as part of the iddah. Khul' is the separation of a man from his wife in exchange for compensation, and it is not merely a woman's request for divorce. It is not permissible for a woman to request a divorce without a legitimate Shar'i reason, or to leave without her husband's permission, except for a legitimate reason. It is preferable for the wife to return to her husband if possible, especially when there are children.