“I’m not seeing how you could disagree with that.”
I only disagree with giving Mary, that faithful woman, a title that God Himself never gives her. He Himself praises her in many ways, but that is not something He ever says or inspires in His Word.
The word "Lord" is used in a number of different ways in Scripture, but in this instance Elizabeth is NOT using "Lord" to mean her husband, or a member of the aristocracy, or a landowner. She is using it as it applies to Jesus in His true dignity, as St. Thomas said, "My Lord and My God."
This is not just a title, but a reality. It's not like a polite term of address what was fetched out of thin air. It comes from the Gospel, as you can see.