Louisa was the eldest daughter of Robert Ruliph Morgan Carpenter (July 30, 1877 - June 11, 1949) (known as "Ruli") and Margaretta Lammot du Pont (May 12, 1884 - May, 1973), daughter of Lammot du Pont. They were married December 18, 1906 in Wilmington, Delaware. Their other children were:
Louisa married du Pont executive John Lord King Jenney (September 9, 1904 - September 7, 2005) on July 20, 1929 and they were divorced in 1935. Jenney then married Anne Marshall West on November 11, 1938. Louisa enjoyed hunting fox (a master of hounds in fact) and pheasant, riding and breeding horses and was one of the first women airplane pilots. Her circle of friends, socialites, acquaintances and lovers included Eugenia (known as "Sister") and her sister Tallulah Bankhead, Louise Brooks, Marion Carstairs, Noel Coward, Greta Garbo, Libby Holman, Z. Smith Reynolds. Louisa was regarded as a lesbian and often appeared in public in men's suits and ties. When Libby Holman was indicted for the murder of her husband Z. Smith Reynolds Louisa Carpenter paid Libby's $25,000 bail, appearing at the Wentworth, North Carolina courthouse in such mannish clothes bystanders & reporters thought she was a man. She died in a crash of her private plane near her Easton, Maryland farm.