By her Immaculate Conception, the Blessed Virgin Mary was preserved from all effects of original sin, in body as well as in soul.
So not only was she filled with grace from conception, but her body was also preserved from original sin and all its effects. Her body was not subject to death, disease, injury, or suffering. However, God granted, and she accepted, suffering and even death as a way to participate in the salvific work of Christ suffering and dying for our salvation. But her body was not subject to such suffering and death due to original sin.
Jesus said: “Indeed, the spirit is willing, but the flesh is weak.” But this does not apply to Mary. Her body was not in a fallen state, and so her flesh was not weak. Her body in no way influenced her spirit toward sin, as happens with fallen human persons.
It is a serious omission, when any explanation of the Immaculate Conception lacks this assertion that her body was also free from the effects of original sin, with her soul. And it is the grave sin of heresy to claim that the Immaculate Conception only preserved the Blessed Virgin Mary from the effects of original sin in the soul (the lack of the state of grace), and not also in the body.
Ronald L. Conte Jr.
Roman Catholic theologian and Bible translator