Is it permissible to delay performing ghusl following menstruation until before Dhuhr prayer, after the cessation of menstruation at dawn, provided that the Fajr prayer is made up?

If a woman becomes pure (tahira) by seeing dryness (jufūf) or the white discharge (al-qaṣṣah al-bayḍā’), she is obligated to pray and fast, even if this occurs before her usual period ends. So, if she becomes pure at dawn, she must perform ghusl (ritual bath) and pray the Fajr prayer before its time expires. However, if purity is not attained until sunrise, she is not required to perform ghusl except for the Dhuhr prayer, and the Fajr prayer is waived for her.