Al-Sa'ib, the freed slave of Umm Salamah (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), narrates from the Prophet (peace and blessings be upon him) that he said: "The best mosques for women are the innermost parts of their houses."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5360