What is the author's style in Roman Fever by Edith Wharton?

The story is told from a third-person, omniscient point of view. This means that readers see and hear what the characters see and hear, and that readers are also privy to their thoughts. However, in this case, the interior life, motivations, and reactions of Mrs. Slade are revealed to a greater extent than those of Mrs. Ansley's. For example, readers know that Mrs. Slade decides to tell the truth about the letter Delphin was supposed to have written 25 years ago because she is envious of her rival and dislikes her, though at the same time she believes she is a good person. Readers also know that she regrets her words after she has said them. On the other hand, not much is revealed about Mrs. Ansley's motivation. Readers do not know, for instance, why Mrs. Ansley decides to reveal the truth about Barbara's parentage.