Soon passing out of sight, memory, or existence; quickly fading or disappearing.
A parapet is a barrier which is an extension of the wall at the edge of a roof, terrace, balcony, walkway or other structure
"Locusts stand I" means you have no legal standing. It is a mishearing of the English pronunciation of the Latin phrase "locus standi" -- literally "place of standing" or more generally; status, social position, right to speak and be heard.
So therefore, Rahel believes she has no legal standing.
an infectious bacterial disease characterized by the growth of nodules (tubercles) in the tissues, especially the lungs.