According to her article in thepeerage, she married twice but had no children.
From artuk.org.
Mary Anne is about 21 and dressed in what is a very Empire style for 1834.
Keywords: 1834, Scott - John, Mary Anne Jervis, Lady Forester of Willey Park, Jervis family, Sombre family, Forester family, British, curly coiffure, under-bodice, scoop neckline, elbow length notched full sleeves, cuffs, clasps, bracelets, over-bodice, jeweled waist band, Empire low waistline, close skirt, wrap