Her article in thepeerage is here.
From the Fine Arts Museums of San Francisco Web site; filled in shadows and increased exposure. The portrait may not be on display.
Here is a look that ran through the 1830s - puffed sleeves and a bodice pinching to a waist marked by a waist band.
Keywords: 1823, Lawrence, Charlotte Georgina Stafford-Jerningham, Stafford-Jerningham family, Fraser family, British, curly coiffure, off shoulder vee neckline, modesty piece, quarter length notched puffed sleeves, Empire low waistline, waist band, A-line skirt, brooch, jeweled arm bands, bracelets, handkerchief, wrap