Purity: Ghusl After Ḥayḍ
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 456:
After a woman’s ḥayḍ has stopped, it is obligatory for her to perform ghusl for prayers and for other ritual acts of worship that must be performed with wuḍūʾ, ghusl, or tayammum. The ghusl for ḥayḍ is performed in the same way as the ghusl for janābah, and the ghusl for ḥayḍ suffices in place of wuḍūʾ, although it is recommended to also perform wuḍūʾ before performing ghusl.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)