The Immaculate Conception means that Mary was conceived with out sin of any kind. It is due to sin (original sin that we have concupiscence) Mary, without original sin, had the preternatural gifts from the first moment of her conception. With this, she had an abundance of grace that is beyond our measure, as she was addressed by the angel (never to anyone else) as,** Full of Grace>** This was never said of any other human., only her. Thus, no baptism, nothing like baptism, Her grace surpassed all other humans with the exception of Jesus, her son, the God-Man. She had to be totally pure, as Jesus took his incarnation from her,
It is because of the preternatural givts that she had such an awesome relationship with her son as they were totally in sinc with one another. This is also why the crucifixion was also more painful to her as a mother than for any other mother who looses a child. She knew of his total innocence and her loss was much greater because of this. I gould go on and on and on. But I think you get the picture.
Deacon Ed B