By definition a segment is the word used to describe each part of something that is divided, it could be a portion cut off from a geometric figure or a determined section of a line or some other object. The word "section" is actually a synonym as it can also be used to describe the parts into which something is or may be divided or from which it is made up.
It seems, (Though it has been awhile since I have had read this story) that she is more open to the oddness of the place. Instead of trying to rationalize this she is only going along with it.
