The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, then added: "It is permissible for a woman, when wiping her head, to wipe with just one finger over the portion of her head that is connected to her, inserting her finger under her head covering to wipe her hair, even if it is as little as the tip of a finger, during the Zuhr, Asr, and ʿIshaʾ prayers. However, during the Fajr and Maghrib prayers, she should remove her head covering and wipe with three fingers."
Commentary #22