Musannaf Ibn Abi Shayba 3:5237

Waki’ narrated to us, [saying] Sufyan narrated to us, from Salamah ibn Kuhayl, from Abu ‘Amr al-Shaybani, who said: ‘Abdullah said: "A woman has never performed a prayer better than a prayer she performs in her house, except if she prays at the Sacred Mosque (al-Masjid al-Haram), unless it is an old woman in her *minqalayha*," meaning her two slippers.