What is the ruling on the fasting of a girl whose menstrual period stops during the day and flows at night during Ramadan?

A girl must perform ghusl upon seeing purity, and then all rulings for pure women apply to her, and her acts of worship are valid. A girl's fast is valid unless she sees blood during the day. She must perform ghusl and pray after the cessation of blood, and she is required to make up the prayers missed during the period of purity. This applies as long as the duration of blood and any interspersed purity does not exceed fifteen days; otherwise, she is considered to be in a state of istihadah (non-menstrual bleeding).