Perhaps consider there is a vast difference between interpreting doctrine/prophecies (what they are and what they mean) and writing an English language version of the Scriptures translated from the Greek/Latin/et al. Goodness!
A feast for something that never happened.
Mary was not "immaculately" conceived.
She was born in sin as any other born of the seen of a man.
As the law in Scripture for passing inheritance gave only men the authority to do so, she couldn't pass on the inherited slavery to sin that only fathers pass to their children.
That was the entire purpose for Christ being born only of a woman and not of the loins of an earthly father.
Therefore, her being born a sinner didn't affect Christ legally.
He escaped that accursed inheritance.