Well, concerning the exegesis of Apoc. 12, I think the best interpretation is that which sees the Blessed Mother as the type of the Church. Hobbledehoy once posted an excellent commentary on this in these forums. St.Ambrose says this of her explicitly. Indeed, theologians say the virginal motherhood of Mary and that of the Church are but one motherhood only. One of the Fathers, St.John Chrysostom if I recall right, says that the Blessed Virgin gloriously gave birth to Christ without pains but experienced pains far greater in giving birth to us at the foot of the Cross, when she consented to become the Mother of the beloved disciple, and thereby of all Christians, suffering with her Son for our sake. This was the sword of sorrow spoken of by the wise man Simeon as well.
Our Blessed Mother as a type of the Church, yes, but also, the
woman of Apoc. xii. 1-2 is always Holy Mother Church, in all the
traditional commentaries, so if you find a Novus Ordo one saying
otherwise, it's obviously from a heretic, probably post Vat.II.
The woman in pain to be delivered in verse 2 is not with child
because of any natural means anyway, but as the Church gives
rebirth by holy Baptism, and by the sacrament of Penance
regenerates the fallen souls, the pain of delivery is the penance of
reparation that is inherent with forgiveness of sins and remission of
temporal punishment due to sins. That's what Purgatory is. But by
the merits of the saints can be applied to our own remission of
temporal punishment, so there is the pain in being delivered. And
the one saint whose merits can account for all such remission is none
other than the Blessed Virgin Mary herself. That's where she comes
in here. It has nothing to do with the physical nativity of Our Lord.
Properly understood, the second verse would not be a problem
for feasts of Our Lady, but since it is so easy to misunderstand it,
that verse should be omitted.
The Novus Ordo penchant for quoting inappropriate verses is
nothing new. That alone is a great reason to have nothing to do
with the Novus Nonsense.