No it is not, as I explained. If Mary saw in herself Isaiah's virgin -- a big if -- she would not point that out as a contradiction to the plan.
The Bible NOWHERE says that Mary had pledged herself to be a perpetual virgin. That is Catholic Tradition
And now to the big if. You just got done constructing an elaborate hypothesis regarding every young Jewish woman dreaming of a virgin birth; regarding Mary immediately recognizing Isaiah's prophecy; regarding her nevertheless uncoherent in the light of the prophecy response, -- and none of that is in the scripture. All there is in the scripture relevant to this is Isaiah's prophecy, the account of the Annunciation and Mary's response. I look at the text and draw conclusions. You build extrascriptural hypotheses, like the rest of Protestant wobbly edifice.
Sorry to see that you think the Virgin was biblically illiterate.
Oh, and it wasn't a contradiction by the way. It was a question...
Seems like you need to do some reading. Start with what I found on a Catholic website since Catholic sources are the only ones you will listen to.
"What is this plan that Jesus has for you and for me? We get a little bit of a hint of this plan in today’s Gospel. Here we have the story of the Annunciation. The Angel Gabriel said to Mary that she has been chosen to be the mother of the Messiah. Now, when God calls three things happen. First of all it appears that God calls us for something that seems to be impossible to achieve. Mary was asked to be the mother of the Messiah. Every Jewish girl had this hope to become the mother of the Messiah. But there was a problem. She was not married. Similarly if we read about the call of the Prophets and about the call of the great men and women in the Old and New Testament, God asked them to do things which seem to be rather difficult to achieve. Very difficult indeed!"