Is it compulsory for a female to cover her feet while she is praying when she is alone or with other ladies or with those eligible to see her body
It is better for her to cover it because of the hadith found in the recording of Ahmad and others. The Prophet pbuh said:
“Allah will not accept the prayer of a woman who has started to menstruate, except with a khimaar (covering)”
(Reported by Ahmad, Abu Dawud, Ibn Maajah and al-Tirmidhi, with a saheeh isnaad).
This does not exclude the time, place or other exceptional excuse. Rather, she may uncover it during after salat, among the afformentioned people.
Some scholars agree that this is not compulsory but the majority of them stand that it is better for her to do so and this is also our stands too.
Allah knows best.