The "daughter" of a city means the people of the city. Alternate translation: "The people of Zion" or "The people who live in Zion" (See: [[rc://en/ta/man/jit/figs-idiom]])
Possible meanings are 1) "has become as small as a hut in a vineyard or a shed in a garden of cucumbers" or 2) "is left the way a farmer leaves a hut in a vineyard or a shed in a garden of cucumbers when he is finished with them" (See: [[rc://en/ta/man/jit/figs-simile]] and [[rc://en/ta/man/jit/figs-explicit]])