emancipatrix
A woman, girl, or any other entity treated as female who emancipates; a female emancipator.
Christianity shall yet emerge from the tents of Mesech and the tabernacles of Kedar, leaving behind her the scenes of her bondage, and put on her coronation robes, and move by universal love to universal empire, the emancipatrix of the oppressed — the ambassadress of heaven — the benefactress of the earth.
Where it comes from
From Latin ēmancipātrīx. By surface analysis, emancipate + -trix.
Adapted from the Wiktionary entry emancipatrix (CC BY-SA 4.0).