It was narrated that Umm Salamah, the wife of the Prophet (ﷺ), said:
"I said: 'O Messenger of Allah, I am a woman with tightly braided hair; should I undo it when performing Ghusl from Janabah?' He said: 'No it is sufficient for you to pour three handfuls of water over your body.'" (IT)
English reference (IT): Vol. 1, Book 1, Hadith 242 (IT)
Arabic reference (IT): Book 1, Hadith 243 (IT)