The Prophet said to her, when she was menstruating: "Undo your braids and bathe." (Sahih)(A narrator) 'Ali said in his narration: "Undo your head."  

أَنَّ النَّبِيَّ ﷺ قَالَ لَهَا وَكَانَتْ حَائِضًا انْقُضِي شَعْرَكِ وَاغْتَسِلِي قَالَ عَلِيٌّ فِي حَدِيثِهِ انَقُضِي رَأْسَكِ  

Asma asked the Messenger of Allah about bathing after ones's period. He said: "One of you should take her water and lote leaves, and purify herself well, or thoroughly. Then she should pour water over her head and rub it vigorously so that the water reaches the roots of her hair. Then she should take a piece of cotton perfumed with musk and purify herself with it." Asma said: "How should I purify myself with it?" He said: "Subhan Allah! Purify yourself with it!" 'Aishah said, as if whispering to her: "Wipe away the traces of blood with it." Then she (Asma) asked him about bathing to cleanse oneself from sexual impurity. He said: "One of you should take her water, and purify herself, and purify herself well, or thoroughly. She should pour water over her head and rub it so that the water reaches the roots of her hair, then she should pour water over her body." 'Aishah said: "How good were the women of the Ansar! For they did not let shyness keep them from understanding their religion properly."  

أَنَّ أَسْمَاءَ سَأَلَتْ رَسُولَ اللَّهِ ﷺ عَنِ الْغُسْلِ مِنَ الْمَحِيضِ فَقَالَ تَأْخُذُ إِحْدَاكُنَّ مَاءَهَا وَسِدْرَهَا فَتَطْهُرُ فَتُحْسِنُ الطُّهُورَ أَوْ تَبْلُغُ فِي الطُّهُورِ ثُمَّ تَصُبُّ عَلَى رَأْسِهَا فَتَدْلُكُهُ دَلْكًا شَدِيدًا حَتَّى تَبْلُغَ شُئُونَ رَأْسِهَا ثُمَّ تَصُبُّ عَلَيْهَا الْمَاءَ ثُمَّ تَأْخُذُ فِرْصَةً مُمَسَّكَةً فَتَطْهُرُ بِهَا قَالَتْ أَسْمَاءُ كَيْفَ أَتَطَهَّرُ بِهَا قَالَ سُبْحَانَ اللَّهِ تَطَهَّرِي بِهَا قَالَتْ عَائِشَةُ كَأَنَّهَا تُخْفِي ذَلِكَ تَتَبَّعِي بِهَا أَثَرَ الدَّمِ قَالَتْ وَسَأَلَتْهُ عَنِ الْغُسْلِ مِنَ الْجَنَابَةِ فَقَالَ تَأْخُذُ إِحْدَاكُنَّ مَاءَهَا فَتَطْهُرُ فَتُحْسِنُ الطُّهُورَ أَوْ تَبْلُغُ فِي الطُّهُورِ حَتَّى تَصُبَّ الْمَاءَ عَلَى رَأْسِهَا فَتَدْلُكُهُ حَتَّى تَبْلُغَ شُئُونَ رَأْسِهَا ثُمَّ تُفِيضُ الْمَاءَ عَلَى جَسَدِهَا فَقَالَتْ عَائِشَةُ نِعْمَ النِّسَاءُ نِسَاءُ الأَنْصَارِ لَمْ يَمْنَعْهُنَّ الْحَيَاءُ أَنْ يَتَفَقَّهْنَ فِي الدِّينِ