"The Prophet ﷺ would put his head out while he was in I'tikaf and I would wash it, while I was menstruating."  

كَانَ النَّبِيُّ ﷺ يُومِئُ إِلَىَّ رَأْسَهُ وَهُوَ مُعْتَكِفٌ فَأَغْسِلُهُ وَأَنَا حَائِضٌ  

"The Prophet ﷺ would put his head out for me while he was performing I'tikaf [1] and I would wash it, when I was menstruating." [1] Mujawir ("next door") here means while performing I'tikaf.  

كَانَ رَسُولُ اللَّهِ ﷺ يُخْرِجُ إِلَىَّ رَأْسَهُ مِنَ الْمَسْجِدِ وَهُوَ مُجَاوِرٌ فَأَغْسِلُهُ وَأَنَا حَائِضٌ  

"I used to comb the hair of the Messenger of Allah ﷺ when I was menstruating."  

كُنْتُ أُرَجِّلُ رَأْسَ رَسُولِ اللَّهِ ﷺ وَأَنَا حَائِضٌ  

Something similar was narrated by Malik, from Az-Zuhri, from 'Urwah, from 'Aishah.  

عَنْ عَائِشَةَ ؓ مِثْلَ ذَلِكَ