Sayyidah Umm Atiyyah (may Allah be pleased with her) narrates: I was among the women who prepared the daughter of the Prophet (peace and blessings be upon him) (for her wedding). He said: "When you pour water over her head, pour it three times in the ritual bath for janabah."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. As for Umm Hakim, the freed slave woman of Sayyidah Umm Atiyyah (may Allah be pleased with her), I have not found anyone who mentioned her.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1475