Who are the daughters of Jerusalem?
The phrase "daughters of Jerusalem" was first used in the Song of Solomon. These are the ladies of the court, the wives of Solomon’s political marriages, potential brides for future arrangements, as well as the wives of Solomon’s noblemen who attended him at court.
Being leading ladies, they often influenced the way others behaved; hence, you find God charging them in Isaiah's time with spreading filth that God must wash away (Isaiah 4:4).
Jesus referred to all the women in Jerusalem as the "daughters of Jerusalem" while on the way to the cross, telling them they should not weep for him but for the troubles soon to come upon them and those they love (Luke 23:28).