Sunan an-Nasa'i, Hadith 1883 ⓘ
It was narrated from Ayyub: "I heard Hafsah saying: 'Umm 'Atiyyah said: They tied the hair of the daughter of the Prophet in three braids."' 'I said: Did they undo it, then make three braids? She said: 'Yes."'
أَخْبَرَنَا يُوسُفُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَجَّاجٌ، عَنِ ابْنِ جُرَيْجٍ، قَالَ أَيُّوبُ سَمِعْتُ حَفْصَةَ، تَقُولُ حَدَّثَتْنَا أُمُّ عَطِيَّةَ، أَنَّهُنَّ جَعَلْنَ رَأْسَ ابْنَةِ النَّبِيِّ صلى الله عليه وسلم ثَلاَثَةَ قُرُونٍ . قُلْتُ نَقَضْنَهُ وَجَعَلْنَهُ ثَلاَثَةَ قُرُونٍ قَالَتْ نَعَمْ .
also referenced under: Book 21, Hadith 66 (In-Book) & Volume 3, Book 21, Hadith 1884 (DarusSalam)