All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.
It is the duty of that husband to advise his wife and show her
the proper method of performing Ghusl from Janabah and that she should pour water over her head even if her hair is tied up. It is authentically reported from the Prophet (peace be upon him) in the Hadith narrated by
Um Salamah (may Allah be pleased with her) that she said:
“O Messenger of Allah, I am a woman who keeps her hair tightly braided, should I undo it to take Ghusl after Janabah?” He (peace be upon him) said, “No, it is enough for you to pour three handfuls of water over your head and then all over yourself. That will purify you.”
(Related by Imam
Muslim in his Sahih [Authentic Hadith Book])
(Part No. 5; Page No. 325) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.