In the narration of Asma bint ‘Umais, Abu Dawud transmitted, (the Prophet Peace be upon him said:
) "She should sit in a tub, and if she sees yellowness appearing (on top of the water) she should wash (three times), once for the Dhuhr and Asr prayers, and once for the Maghrib and Isha prayers, and once for the Fajr prayer, and she should then perform ablution in between those times."