What is the author's style in Almost Heaven by Judith McNaught?

The language of this novel works because it uses some of the stiff language expected of the time period in which the novel is set. The language gives authenticity to the plot of the novel by including some terminology and slang that would have been used during the time period in which the novel is set.However, the writer does not go overboard in using this stiffer language, allowing the reader to get a feel for the period without being overwhelmed with unusual phrases or stiff dialogue.