What is Eve's Mother's Portrait

When Eve visits Westlands for the first time, her stay is brief and she does not have -- or want -- an opportunity to look around the large home, so she is unaware that a portrait of her mother still hangs there. Later, when Nan visits the house for the first time with Simon, she tells Eve about the portrait in a thinly-veiled attempt to achieve superiority by demonstrating that she is now closer to Eve's family than she herself is.