Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
Is it permissible for a male teacher to teach a woman the Qur’an?
This is permissible if the male teacher teaches from behind a veil and as long as the two are not alone together. It has been narrated that: “A man must never be alone with a woman even if he is teaching her the Qur’an and even if she is Maryam bint `Imran.” The Companions would take knowledge from the wives of the Prophet, the Mothers of the Believers from behind a veil.