Her article in thepeerage is here.
From fripperiesandfobs.tumblr.com.
Lady Augusta married in 1885 and her dress in this portrait has a large bustle suggesting this photo dates from about that time. Her dress has a daring neckline and minimal sleeves, essentially ornamented straps.
Keywords: Leighton, Amy Augusta Coleridge, Lady Coleridge, Lawford family, Coleridge family, British, straight coiffure, sweetheart neckline, strap sleeves, bows, ruffles, vee waistline, bustle, fan