The song is about when she gave birth and if she knew then. Did she know as she was holding the baby what the future events that were going to take place would be?
No.
Yes, she knew she was giving birth to the Messiah. That was clear.
She she know at that time or understand at that time all that that entailed?
I’d have to say no.
People said they never heard of a blind man being healed after one of Jesus miracles. How would she have known that? Or walking on water? Like that happened before.
And yes, she later did learn that He could do miracles, but since most if not all of Israel missed the suffering servant aspect of the Messiah, did she know He was going to die a cruel death on a Roman cross and that was how our sins would be expiated?
I kind of doubt it. The Jews were looking for the conquering King who would deliver them from the bondage of Rome.
Yes, she learned it later but I would imagine that it played out not in any way that she would ever have imagined. After all, His family thought He was crazy and tried to take Him back home. Mark 3:21. If Mary knew what was to happen, then she could have told them so.
No, but by "in essence" i meant she realized enough to know He could do so. If the song asked, Mary, did you know, that the Son you had would worry and confuse you, did you know that your baby boy would someday be rejected by His own, for His Father's will and business was not always understood by you, then the answer would be no.
And if the song asked,
Mary did you know that your baby boy will be shown with goddess some say is you?
Mary did you know, that your baby boy would be said to make you the exalted Queen of Heaven?
Did you know that your baby boy would not only be prayed to but you?
This child that you've delivered, will be said to be much like you?
Mary did you know, that your baby boy will be said to call you ever-sinless?
Mary did you know, that your baby boy will be said to call you ever-virgin?
Did you know that you will be beseeched as almost almighty?
And when you kiss your little baby, you have kissed your fellow-redeemer?
Oh Mary did you know that your baby boy will be said to already have raised your body to Heaven?
Did you know men will say that you dispense all grace to men?
Priests will leap, Catholics will speak, praises of you as surpassing all in creation?
Then the answer would be God forbid.