What do you think "conceived immaculately" means?
Do you believe in the Fall of Adam and Eve?
Did the Apostle Paul say that sin entered the world through Adam or Eve - or both?
Adam was created from the dust of the earth; Eve from his rib. Neither were “conceived.”
To me - and I admit to being less than an expert - to be conceived immaculately means conception without human impregnation (which is to be conceived without Original Sin) which I accept readily in the case of Jesus but not His mother.