Her article in thepeerage is here while her article in Wikipedia is here. She bore a son by her husband, Francis Seymour-Ingram, 2nd Marquess of Hertford and "She and George IV Hanover, King of the United Kingdom were associated between 1807 and 1819."

1781 Isabella, 2nd Marchioness of Hertford, as Lady Beauchamp by John Downman (Wallace Collection - London UK)
