Its procedure is as follows: she intends to remove the state of ritual impurity or to attain purity for prayer and the like, then says, “In the name of Allah.” Next she pours water over her entire body, ensuring that the roots of the hair on her head are soaked. She is not required to undo her hair if it is braided; it is enough to let the water reach its roots. Should she add sidr (lotus leaves) or any cleansing agent to the water, that is commendable. After completing the bath, it is recommended to take a piece of cotton scented with musk or another fragrance and place it at the vaginal opening, for the Prophet ﷺ instructed Asmāʾ to do so. (1)

Important note when a menstruating or postpartum woman becomes pure before sunset
Important notice:
If a menstruating or postpartum woman becomes pure before sunset, she must pray the Zuhr and ʿAsr of that day. If she becomes pure before dawn, she must pray Maghrib and ʿIshāʾ of that night, because in cases of excuse the time of the later prayer counts for the earlier one.

Shaykh al-Islām Ibn Taymiyyah said in his Fatāwā (22/434): “For this reason the majority of scholars—Mālik, al-Shāfiʿī, and Aḥmad—held that if a menstruating woman becomes pure at the end of the day she performs both Zuhr and ʿAsr, and if she becomes pure at the end of the night she performs both Maghrib and ʿIshāʾ, as this was transmitted from ʿAbd al-Raḥmān ibn ʿAwf, Abū Hurayrah, and Ibn ʿAbbās; for the prayer times are shared in the case of excuse. So when…"