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

Charlotte is Mr. Harger's girlfriend, and the woman fighting on the other side of Paul's wall. She is described stereotypically, as blond and messy. She evidently shot at Mr. Harger and missed, whether on purpose or not, the reader is not told. She treats Paul like a baby, throwing money at him and telling him to keep everything a secret. She wears "Tabu," which, according to Mrs. Leonard's reaction, is a cheap and trendy perfume.