Is it permissible for a woman to uncover her face and hands during Hajj while her Hajj remains valid?

A woman's Hajj is valid and is not nullified by uncovering her hands and face. Rather, she is prohibited from wearing the niqab and gloves. If men pass by her, she should lower over her face that which conceals it from them, just as the wives of the Prophet, peace and blessings be upon him, used to do.