It might be central, but it's hardly unique:
Wiki article about the Goddess of Liberty:
A temple was erected to the goddess Libertas on the Aventine Hill in Rome by the father of Tiberius Gracchus during the second Punic War. A statue of the goddess Libertas was also put up by Clodius on the site of Cicero's house after it had been pulled down.
From Liberty Story:
Historian Nancy Jo Fox explained, "the Goddess of Liberty appeared in art as a robed female holding a scepter, indicating sovereignty over herself, with a liberty-loving cat at her feet alongside a broken jug (shattered symbol of confinement) and crowned by Phrygian cap, the pilleus libertatis, bestowed upon slaves when granted freedom."
The way in which the theme of liberty is portrayed in the Christian Bible—through the concepts of salvation, free will, the opportunity to choose good over evil—is indeed unique.
And “liberty as a woman,” from the link you give, describes another concept central to the Christian Bible. The ultimate form of liberty. Liberty as freedom from sin, the liberty of our Blessed Virgin Mary.