DOUAY-RHEIMS 12:
The vision of the woman clothed with the sun and of the great dragon her persecutor.
[1] And a great sign appeared in heaven: A woman clothed with the sun, and the moon under her feet, and on her head a crown of twelve stars: [2] And being with child, she cried travailing in birth, and was in pain to be delivered. [3] And there was seen another sign in heaven: and behold a great red dragon, having seven heads, and ten horns: and on his head seven diadems: [4] And his tail drew the third part of the stars of heaven, and cast them to the earth: and the dragon stood before the woman who was ready to be delivered; that, when she should be delivered, he might devour her son. [5] And she brought forth a man child, who was to rule all nations with an iron rod: and her son was taken up to God, and to his throne.
[1] "A woman"... The church of God. It may also, by allusion, be applied to our blessed Lady. The church is clothed with the sun, that is, with Christ: she hath the moon, that is, the changeable things of the world, under her feet: and the twelve stars with which she is crowned, are the twelve apostles: she is in labour and pain, whilst she brings forth her children, and Christ in them, in the midst of afflictions and persecutions.
While I have no idea what is meant by "It may also, by allusion, be applied to our blessed Lady." It certainly couldn't mean she had "children" could it?
the allusion is pretty mixed. She wears Christ, the sun, like a coat, but she gives birth to him, and the apostles perch on her head. Seems like when you explain a set of symbols, you explain it all logically, using the actual old testament references would be a good place to start the ‘plaining, Ricky.