Her article in thepeerage is here. Also posted to the Revolutionary, Napoléonic, and Romantic Era Album here.
From art.uk; filled in shadows and increased exposure.
Lady Townley Balfour looks like a well-preserved 50-or-so and the dress with its broad shoulders, sleeves, and tight waist support that.
Keywords: Rothwell, Florence Townley Balfour, Lady Florence Cole, wavy coiffure, wide-brimmed feathered hat, earrings, fitted criss-cross bodice, sweetheart décolletage, dual upper puffed sleeves, cuffs, bracelets, rings, waist band, wrap