Elizabeth is not asking for information. She was showing how surprised and happy she was that the mother of the Lord had come to her. Alternate translation: "How wonderful it is that the mother of my Lord has come to me!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
It can be made clear that Elizabeth was calling Mary "the mother of my Lord" by adding the word "you." Alternate translation: "you, the mother of my Lord" (See: [[rc://en/ta/man/translate/figs-123person]])