Dolores - Jacqueline Susann
To be fair, I recall reading that Susann had written this toward the end of her life, and she was pretty sick by then. Dolores wasn't really supposed to be a book, but a piece for a magazine, IIRC - a "Jackie by Jackie" story that became a novella. It's basically a fictionalized account of Jacqueline Kennedy's life after JFK's assassination - her courtship with a rich Greek businessman. The writing is choppy and probably should have been polished more.