All I can find about her, beside this portrait, is she married academician Count Matthias von Hermansson, his second wife, in 1770.
From s41.radikal.ru/i093/1206/c1/35f26b227020; spots removed throughout image with Photoshop by gogm.
Here is a Swedish Baroness dressed to ride in military style. Nothing of her skirt s shows in this Lundberg portrait. Her coiffure dates this to about the early 1760s.
Keywords: Lundberg, Ulrica Cedercreutz, Baroness, Swedish, long straight coiffure, pig tail, bows, feathered hat, scarf, high neckline, jabot, jacket, collar, frogging, buttons, vest