Are you kidding? Like I wouldn't know where it is? It's the incident at the Marriage Feast at Cana. She's in the immediate sense talking to the bartenders. In the spiritual sense she's saying it to everyone.

Look at ALL the prophecies about Christ in the OT and the NT. Every one of them is (in the immediate sense) addressed to somebody else "about" something else.

Just to pick the most famous one: (Isaiah 7:14) Therefore the Lord Himself will give you a sign: Behold, the virgin shall conceive and bear a Son, and shall call His name Immanuel.

Who he's talking to: Ahaz, king of Judah

Immediate purpose of the prophecy: Isaiah counsels King Ahaz to trust in God and not to form an alliance with the Northern Kingdom to oppose Assyria

Sign that this prophecy about Assyria is true: a maiden ("almah") will give birth to a son, and she will call his Emmanuel. (A polygamous king's youngest, newest wife was called "the almah.")

When: sometime around 732/731 BC.

Meaning: Did Ahaz know that the principal meaning of this prophecy wouldn't occur until 700+ years later and would refer to the Messiah and to the Mother of the Messiah? No. He didn't even believe it back then, because he blew off what Isaiah told him.

Did Isaiah know that the underlying meaning would unfold in 700+ years? Hard to say. Th NT writers quote it as a proof of Christ.

That simply illustrates that prophecies rarely have just one meaning; and the greater meaning is not to be understood carnally, but spiritually.

When Mary says "Do whatever He tells you," buddy, she's talking to YOU. More about Mary, the Mother of the Messiah, our mother:

"Then the dragon was enraged at the woman and went off to wage war against the rest of her offspring -- those who keep God’s commands and hold fast their testimony about Jesus." Revelation 12:17 Her other offspring --- the other children of Mary--- are defined as "those who keep God's commands and hold fast their testimony about Jesus."

Don't be undiscerning about who are her children and who her message is for.

Tell me, do you know where that line in Scripture is, and who it’s being spoken to?

Well; Catholicism uses the context of that verse in a twisted way to convince it's obediant followers that Jesus is somehow subservient to His mother.

But; alas; the text in NO way shows that at all!

All the Words of Mary...
...as recorded in the Bible.

...To the angel
“How will this be,” Mary asked the angel, “since I am a virgin?”
Mary answered. “May it be to me as you have said.” (Luke 1:30-38)

...To Elizabeth
And Mary said: “My soul glorifies the Lord and my spirit rejoices in God my Savior, for he has been mindful of the humble state of his servant. From now on all generations will call me blessed, for the Mighty One has done great things for me—holy is his name. His mercy extends to those who fear him, from generation to generation. He has performed mighty deeds with his arm; he has scattered those who are proud in their inmost thoughts. He has brought down rulers from their thrones but has lifted up the humble. He has filled the hungry with good things but has sent the rich away empty. He has helped his servant Israel, remembering to be merciful to Abraham and his descendants forever, even as he said to our fathers.” (Luke 1:46-55)

...To Jesus
His mother said to him, “Son, why have you treated us like this? Your father and I have been anxiously searching for you.” (Luke 2:48-50)

... at Cana
And when the wine gave out, the mother of Jesus said to Him, “They have no wine.”
His mother said to the servants, “Whatever He says to you, do it” (John 2:3-5).

...To the angel“How will this be,” Mary asked the angel, “since I am a virgin?” Mary answered. “May it be to me as you have said.” (Luke 1:30-38)

...To JesusHis mother said to him, “Son, why have you treated us like this? Your father and I have been anxiously searching for you.” (Luke 2:48-50)

... at CanaAnd when the wine gave out, the mother of Jesus said to Him, “They have no wine.”His mother said to the servants, “Whatever He says to you, do it” (John 2:3-5).

...To the angel
“How will this be,” Mary asked the angel, “since I am a virgin?”
Mary answered. “May it be to me as you have said.” (Luke 1:30-38)

...To Jesus
His mother said to him, “Son, why have you treated us like this? Your father and I have been anxiously searching for you.” (Luke 2:48-50)

... at Cana
And when the wine gave out, the mother of Jesus said to Him, “They have no wine.”
His mother said to the servants, “Whatever He says to you, do it” (John 2:3-5).