لَا الْمَضْفُورَ مِنْ شَعْرِ الْمَرْأَةِ إِنْ سَرَى الْمَاءُ فِي أُصُولِهِ
A woman does not have to undo her braids when water reaches the roots/scalp. If the braid or matted hair prevents water from reaching the roots, it must be opened enough for the required water to reach. The commentary distinguishes this concession from the man's braided hair.
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Ghusl: The Eleven Obligatory Areas
لَا الْمَضْفُورَ مِنْ شَعْرِ الْمَرْأَةِ إِنْ سَرَى الْمَاءُ فِي أُصُولِهِ
A woman does not have to undo her braids when water reaches the roots/scalp. If the braid or matted hair prevents water from reaching the roots, it must be opened enough for the required water to reach. The commentary distinguishes this concession from the man's braided hair.