The Prophet said: "Allah does not accept the prayer of a woman who menstruates (i.e., an adult woman) except with a head cover." (Using translation from Ibn Mājah 655)   

رَسُولَ اللهِ ﷺ قَالَ لَا تُقْبَلُ صَلَاةُ حَائِضٍ إِلَّا بِخِمَارٍ  

‘A’ishah came to Safiyyah Umm Talha al-Talhat and seeing her daughter she said: The Messenger of Allah ﷺ entered (into the house) and there was a girl in my apartment. He gave his lower garment (wrapper) to me and said; tear it into two pieces and give one-half to this (girl) and the other half to the girl with Umm Salamah. I think she has reached puberty, or (he said) I think they have reached puberty. Abu Dawud said: Hisham has narrated it similarly from Muhammad b. Sirin. (Using translation from Abū Dāʾūd 642)   

أَنَّ عَائِشَةَ نَزَلَتْ عَلَى صَفِيَّةَ أُمِّ طَلْحَةِ الطَّلَحَاتِ فَرَأَتْ بَنَاتٍ لَهَا فَقَالَتْ إِنَّ رَسُولَ اللهِ ﷺ دَخَلَ وَفِي حُجْرَتِي جَارِيَةٌ فَأَلْقَى إِلِيَّ حَقْوَهُ وَقَالَ شُقِّيهِ بِشِقَّتَيْنِ فَأَعْطِي هَذِهِ نِصْفًا وَالْفَتَاةَ الَّتِي عِنْدَ أُمِّ سَلَمَةَ نِصْفًا؛ فَإِنِّي لَا أُرَاهَا إِلَّا قَدْ حَاضَتْ أَوْ لَا أُرَاهُمَا إِلَّا قَدْ حَاضَتَا  

[Machine] If the young girl menstruates, she must do what her mother must do and say among the women.  

إِذَا حَاضَتِ الْجَارِيَةُ وَجَبَ عَلَيْهَا مَا يَجِبُ عَلَى أُمِّهَا تَقُولُ مِنَ السِّتْرِ