Is There a Difference Between a Child and a Mother?

If mary was immaculately conceived, wouldn't she have known that she was a? The virgin from isaiah seven? 14? Well, not necessarily. Even if god had given you special graces so that you could follow his law, it wouldn't follow that god was also calling you to do something unprecedented in salvation history. No one else, ever before in the history of salvation had been asked to do something like that. So it is quite shocking. Can you give one example new testament where it describes god or jesus being a preemptive saviour instead of a redemptive, redeeming saviour? I believe all things are possible with god.