1762 (after) Maria Anna von der Wahl (1736-1808), widow of Joseph Wilhelm of Fürstenberg by ? (Schloß Heiligenberg - Heiligenberg, Germany)
This is what I found out about her in Wikipedia, "On 2 February 1716, Joseph Wilhelm Ernst was raised to princely status. He married in 1723 to the Countess (Gräfin) Maria Anna von Waldstein und Wartenberg (22 February 1707 – 12 November 1756). After her death in 1756, he married in 1761 to Maria Anna Countess (Gräfin) von der Wahl (born 22 September 1736 – 21 March 1808). He died in Vienna, 29 April 1762."
From Wikimedia; the background was heavily damaged so it was replaced using Photoshop by gogm.