Does a woman's prayer become invalid if her feet become exposed during the prayer?

Question:
He says: Honorable Shaykh, may Allah grant you success, if a woman's feet become exposed during the prayer, does she have to repeat it, or is the prayer invalid? If something of her body becomes exposed and she is unaware of it, and the prayer ends

Answer:
then her prayer is valid. However, if something of her body becomes exposed and she is aware of it but leaves it, her prayer is invalid; because she has lost one of the conditions of the prayer, which is covering the 'awrah (the part of the body that must be covered).