If she is emancipated while married to a free man, she has no option; rather, she has the option if she is married to a slave.
His statement: “If she is emancipated while married to a free man, she has no option; rather, [she does] if she is married to a slave,” means that a free man marries a female slave subject to the three aforementioned conditions, and then her master emancipates her. She has no option to annul the marriage, because although she has been emancipated, she has not risen above her husband: she is free, and her husband is free. The deficiency that had existed in her has been removed, but this has not elevated her to a rank higher than that of her husband. Therefore, she has no option. This is the well-known position of the madhhab, and it is the view held by most scholars.
But if she is emancipated while married to a slave, then she has the option, because she has become of higher status than he is. The evidence is the hadith of Barirah—may Allah be pleased with her—who, when she was emancipated, was given the choice by the Prophet—may Allah’s blessings and peace be upon him—between remaining with her husband and annulling the marriage. She chose separation. Her husband would follow her through the marketplaces of Madinah, for he loved her intensely while she detested him intensely. He followed her, weeping, wishing that she would not leave him, while she paid him no heed. The Messenger—may Allah’s blessings and peace be upon him—even interceded with her on his behalf. She said, “O Messenger of Allah, if you are commanding me, then I hear and obey; but if you are merely advising me, I have no need of him.” (1)
This proves that if she is emancipated while married to a slave, she has the option. The narrators differed concerning Mughith: was he a free man or a slave? (2) Most of the narrators held that he was a slave.