LUKE 1:46-56
Mary and Elizabeth were cousins. Elizabeth knew that Mary was engaged but not yet married. Mary was just a teenager, as Elizabeth prophesied about her giving birth with the Messiah. That didn't come out of her mind, she would never have said it because it was illogical.
Elizabeth referred to Jesus as her Lord and Savior, having just been conceived. Many others proclaimed Him Lord at His birth and after His birth.
John the Baptist, who was just six months older at the time, leapt for joy in his mother's womb. It was when he was filled with the Holy Spirit. God considered him a person and filled him with His Spirit.
Elizabeth placed a blessing on Mary for believing what the Lord had told her and assured her it would come to pass. It was encouragement and confirmation to Mary.