The Ruling on a Woman Who Does Not Wear the Hijab

Question:
Our sister asks and says: If a woman does not wear the head covering, is she sinful?

Answer:
Yes, it is obligatory to cover it ......, but in prayer, there is no harm in uncovering her face if there is no non-mahram present, for the Sunnah is to pray with the face uncovered.
As for the feet, they are covered in prayer, and likewise the hands; covering them is better, but if she uncovers them in prayer, the correct view is that there is no blame on her, though covering them is better.
As for the face, the Sunnah is to uncover it in prayer, but if there is a non-mahram present, she covers everything, both in prayer and outside of it. Yes.