Mu'adhah al-Adawiyyah (may Allah have mercy on her) said that a woman asked Sayyidah Aishah (may Allah be pleased with her): "What is the matter with the menstruating woman, that she makes up the fasts but does not make up the prayer?" Sayyidah Aishah (may Allah be pleased with her) said: "Are you a Haruriyyah?" She said: "I am not a Haruriyyah; rather, I want to ask." Sayyidah Aishah (may Allah be pleased with her) said: "This used to happen to us in the time of the Messenger of Allah (peace and blessings be upon him), and we were ordered to make up the fasts but not the prayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8112