"I will leave for the moment how being filled with Grace from the moment of her conception does or does not differ from the Catholic idea of the Immaculate Conception. For the now can we agree that Mary was indeed, unlike the rest of us, conceived filled with Grace?"
My understanding of the consensus patrum is that God's grace, His uncreated energies fall equally on all of us, good and evil just like the sun shines on the blind and the sighted equally. This would seem to militate against the idea that Panagia was any more filled with grace at her conception than the rest of us, would it not?
It sure can be hard for the major families of Christianity to dance together to different time signatures. Protestants waltz along in 3/4 time praying to the Father in the Name of Jesus with the power of the Holy Spirit. Meanwhile, our dear Catholic friends have an additional partner in their dance, and try to convince us that the true waltz is done in 4/4 time! God the Father, God the Son, God the Holy Spirit, and goddess the Mother all want to dance with you!