From reading where and why this dogma was finally declared nearly two thousand years later, it looks as though the "cult of Mary" was the impetus, prodded by many supposedly miraculous visions, apparitions and visitations from "Mary" or one purporting to be her. There was certainly no Apostolic witness for the dogma nor was it even considered until centuries after the Apostles all died. Not even John, who was in charge of caring for Mary when Jesus ascended, makes any mention of her in his epistles.
If Catholics want to believe this is all part of the truth it's no skin off my nose. But, when they assert they alone have the "fullness of the faith" and we non-Caths are bound for hell because we aren't in line with everything their "traditions" decree, then I will unabashedly defend why I don't believe like them on this and several other doctrines.
Preach it, sister!!!!!!