All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
If a woman is a Muslim, her non-Muslim father has no guardianship over her. So, her guardianship moves to her closest male relatives [provided they are Muslims], and then to the general Muslims.
If she has no Muslim male relative, then the Muslim judge - if any -marries her off. Otherwise, it would be the Muslim community who marries her off. So, an Islamic Association or an Islamic Center marries her off.
Allaah Knows best.