Who is Mary Kraft from Welcome to the Monkey House and what is their importance?

Mary is Nancy's fellow Hostess at the Suicide Parlor. She is a brunette and, like Nancy and all suicide hostesses, a "pretty, tough-minded and intelligent" girl. As a suicide hostess, she is also a virgin, at least six feet tall, and "holds advanced degrees in psychology and nursing." Mary shares Nancy's anger about Billy the Poet. She has disdain for the hostesses that have been targeted by him so far. She believes they should be able to defend themselves or at least let the police know what he looks like. When Billy the Poet is supposedly caught, Mary leaves with Sheriff Crocker to go see him.