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Baghdad Khatun was first married to Hasan Buzurg, the future founder of the Jalayirid dynasty, in 1323. Shortly after, she caught the attention of Ilkhan Abu Sa'id, who had become infatuated with her despite her marital status; this did not please the amir Chupan. Abu Sa'id compelled Hasan Buzurg to divorce her in 1325, and then married her afterwards. She wielded considerable influence over her Ilkhan spouse, attaining the position of Kodavandgar (great lord). Using her power, Baghdad Khatun prevented the marriage of Chupan's widow Korducin to Ghiyath ud-Din of Herat, who had murdered her father in 1327. She had also managed to gain respectful treatment of her stepmother Sati Beg and Sati's son Surgan.
During her marriage with Abu Sa'id, various rumors surfaced involving her participation in conspiracies against the Ilkhan. Speculation that she had plotted with Hasan Buzurg in 1331 and 1332 were dismissed but were not forgotten. When Abu Sa'id died, it was believed by some that she was behind his death. Whether she had any involvement with his death or not stills remains a mystery; in any case, she was charged with his murder by his successor the Ilkhan Arpa Ke'un. Baghdad Khatun was further accused of inviting the invasion of the Ilkanate by Ozbek Khan of the Golden Horde. She was executed by Arpa Ke'un in 1335.