Does a wife's 'Umrah become invalid if she forgets to uncover her face during Tawaf and Sa'i?

The Messenger of Allah, peace and blessings be upon him, said: "A woman in ihram should not wear a niqab, nor should she wear gloves." It is permissible for her to draw her garment down from above her head over her face if strange men pass near her, as A'isha, may Allah be pleased with her, did. If a woman covers her face with a burqa or niqab while in ihram, she has committed a prohibited act for which a fidyah is required: fasting for three days, or feeding six poor persons, or sacrificing a sheep. Some jurists are of the opinion that the fidyah is obligatory for one who forgets or is ignorant, while the more preponderant opinion is that no fidyah is due upon them, based on the saying of Allah the Almighty: "Our Lord, do not take us to task if we forget or make a mistake," and His saying: "And there is no blame upon you for that in which you have erred." Paying the fidyah to avoid scholarly disagreement is a good deed.