Ahmad Raza Khan states in several places of his Fatawa Ridhwiyya 23/653 categorically that it is forbidden for women to learn how to write. In the first sentence of his answer he writes:
“It is Islamically wise forbidden for women to learn how to write and a sunnah of the Christians.”
This is also mentioned at page 691.
Remember, that our Barelwi brethren state that Alahazrat never made a slip of the pen, and always told the truth. As mentioned in the introduction of Ahkame Shari’at (Zia al-Qur’an Publications 2002 edition).