Justice In America
The lady is stating how she is crying over current lack of justice in America.
The lady isn't happy and since justice is "blind" she's happy she can't see the unfairness going on in America right now.
Symbolism: The lady stands for justice
Exaggeration: The lady is literally crying only because of the current injustice in America
Irony: America should be fair like the lady wants, but instead it is terribly unfair