The Daughter Of Jerusalem
The first Biblical mention of the figurative term "daughter of Jerusalem" was at the time that the city of Jerusalem (and The Southern Kingdom of Judah as a whole) was innocently under siege (i.e. the result of aggression by a foreign power alone) by the Assyrians (who had previously conquered The Northern Kingdom of "Israel"):
"19:20 Then Isaiah the son of Amoz sent to Hezekiah, saying, Thus saith the LORD God of Israel, That which thou hast prayed to me against Sennacherib king of Assyria I have heard. 19:21 This is the word that the LORD hath spoken concerning him;
"The kingdom shall come to the daughter of Jerusalem"
The above-mentioned historic incident, as recorded in 2 Kings, was also recorded in the prophetic (and historical) book of Isaiah.
"37:21 Then Isaiah the son of Amoz sent unto Hezekiah, saying, Thus saith the LORD God of Israel, Whereas thou hast prayed to me against Sennacherib king of Assyria: 37:22 This is the word which the LORD hath spoken concerning him;
The LORD rescued "the daughter of Jerusalem" from the Assyrians. But later, due to their religious corruption, the LORD permitted the Babylonians (The Assyrian Empire had by then fallen and The Babylonian Empire was taking its turn in humanity's endless and futile struggle to be the "leader" of the world) to conquer and destroy Jerusalem. Jeremiah's lament (that's why the book is called Lamentations) for "the daughter of Jerusalem" was the result of the "virgin daughter of Zion" (see Who, What or Where Is Zion?) committing spiritual harlotry (see also The Two Naughty Sisters).
"2:13 What thing shall I take to witness for thee? what thing shall I liken to thee, O daughter of Jerusalem? what shall I equal to thee, that I may comfort thee, O virgin daughter of Zion? for thy breach is great like the sea: who can heal thee?
While "the daughter of Jerusalem" existed as a physical nation, it was at the same time merely a living prophecy of the spiritual "daughter of Jerusalem" to which the Kingdom of God is coming - and through whom the children of God will be born (see the Fact Finder question below). The famous "swords into plowshares" (Micah 4:3 KJV) speaks of the future time when "the kingdom shall come to the daughter of Jerusalem" (Micah 4:8 KJV).
"4:1 But in the last days it shall come to pass, that the mountain of the house of the LORD shall be established in the top of the mountains, and it shall be exalted above the hills; and people shall flow unto it. 4:2 And many nations shall come, and say, Come, and let us go up to the mountain of the LORD, and to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for the law shall go forth of Zion [see Zionism], and the word of the LORD from Jerusalem.
Fact Finder: While Christ was not married as a mortal man, that does not mean that He will not have a "wife." Who is the betrothed bride of Christ? When will the marriage happen?