Jamieson, Fausset and Brown on Isaiah 1:8

8. daughter of Zion--the city (Psa 9:14), Jerusalem and its inhabitants (2Ki 19:21): "daughter" (feminine, singular being used as a neuter collective noun), equivalent to sons (Is 12:6, Margin) [Maurer]. Metropolis or "mother-city" is the corresponding term. The idea of youthful beauty is included in "daughter."

left--as a remnant escaping the general destruction.

cottage--a hut, made to give temporary shelter to the caretaker of the vineyard.

lodge--not permanent.

besieged--rather, as "left," and Is 1:9 require, preserved, namely, from the desolation all round [Maurer].