Reference: http://mufti.af.org.sa/ar/content/يلزمها-الإمساك-والاغتسال-لصلاة-الفجر
Question: A woman completed her menses before Fajr, but did not have a bath [or shower] until after sunrise; so should she be fasting or not?
Response: If her bleeding stopped before the arrival of Fajr, then she is required to fast – even if she delays her bath [or shower]. However, it is not permissible for her to wait until sunrise, she should instead hasten in having a bath [or shower] as soon as her bleeding stops so she can pray the Fajr prayer on time. And it is not permissible for her to delay the bath [or shower] until after sunrise.
