So does Shaykh al-Tuwaijri claim that an adult woman is required to cover her face while she is praying?

Likewise, consider the Prophet’s ﷺ directive concerning the woman who had vowed to perform Hajj bare-headed:

(Sound) “Order her to mount, to wear her khimar, and to perform the pilgrimage.”

In another wording: “…and let her cover her hair.”

This narration is also sound; I have authenticated it in al-Aḥādīth al-Ṣaḥīḥah (2930).

Will the shaykh, then, allow a woman in the state of iḥrām to lower her khimar over her face, even though he knows the Prophet’s ﷺ statement: “A woman in iḥrām must not wear a niqab…?”

The same applies to the hadiths concerning wiping over the khimar during wuḍūʾ—something the Prophet ﷺ himself practiced and commanded for both men and women. Who, after all this, would side with the shaykh in an opinion that contradicts the Quran, the Sunnah, and the scholars’ consensus, as was shown earlier in the commentary on the verse about post-menopausal women? And we still have further evidence, as follows.

Among that evidence is the remark of the eminent scholar al-Zabīdī in Sharḥ al-Qāmūs (3/189) concerning Umm Salamah’s report—may Allah be pleased with her—“that she used to wipe over the khimar,” recorded by Ibn Abī Shaybah in al-Muṣannaf (1/22):

By “khimar” she meant the turban, for a man covers his head with a turban just as a woman covers hers with her khimar. ⦗17⦘