Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.074D.
Section : What she can do, menstruating women (with Prolonged Flows of Blood).
She is to be considered a pure person, and she may pray, fast, remain in the mosque, recite the Qur’an, touch a copy of the Qur’an, and so on.