Plantation by Dorothea Benton Frank wasn't so much about the Plantation, which didn't really come into play until half way through the novel, but about Caroline who was living in New York at the story beginning. It was still a pleasant read with typical South Carolina quirky characters.
From the cover:
Caroline Wimbley Levine always swore she'd never go home again. But now, at her brother's behest, she has returned to South Carolina to see about Mother - only to find that the years have not changed the Queen of Tall Pines Plantation. Miss Lavinia is as maddeningly eccentric as ever . . . but she soon discovers that something is different this time around. It lies somewhere in the distance between her and her mother - and in her understanding of what it means to come home.