Bismillah

Al-jawab billahi at-taufeeq (the answer with Allah's guidance)



They do not have to cover their feet (area below the ankles) in Salah. The feet are nakedness outside Salah, not in Salah.

Ibn `Abidin reported this as one of the authentic views in "Radd al-Muhtar".

It may be noted that Hafiz Ibn Taymiyyah, the Hanbali, also favored this opinion. He says,
"And similar [is the case with] the foot. It is permissible for her to show it [in salah]according to Abu Hanifah, and [this] is the stronger [position], for `A'ishah considered it of the apparent beauty. . . . . So, this is an evidence that women used to show their feet initially, just as they used to show their faces and hands . . . . for they used not to walk in khuffs or shoes. [Moreover], to cover these in [salah] poses a great hardship, and Umm Salamah said, 'A woman should pray in an ample garment which covers the tops of her feet,' and so when she makes sajdah, the bottoms of her feet may show." [Hijab al Mara'ah wa-Libasuha fi al-Salah, pp. 17-18]


And Only Allah Taa`la Knows Best.