It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that the Noble Prophet (peace and blessings of Allah be upon him) said: "The most beloved prayer to Allah from a woman is the one she performs in the darkest part of her house."
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صلاة النساء فى الجماعة / 1691