Conflating vestal virgins and the virgin Mary is like conflating trees and bushes. Vestal virgins were not "virgins" beyond their vow of celibacy and devotion to the goddess Vesta, which was for like thirty years. Before or after that time of service sexual purity wasn't considered.
Mother Mary was created and chose by God to be the vessel which brought forth Jesus. What does "virgin" Mary mean? I don't know.
Not conflating. Prizing. It should be hard out there for a hoe, trying to steal my granary and my dough