This is her Wikipedia article, "Hilda Charlotte Wilhelmine of Luxembourg, Grand Duchess of Baden (5 November 1864 – 8 February 1952) was the daughter of Adolphe of Luxembourg, who was Duke of Nassau until he was deposed in 1866.
Marriage - She married Frederick II, Grand Duke of Baden on 20 September 1885 in Schloss Hohenburg. The marriage did not produce surviving children.
Frederick and Hilda were deposed as Grand Duke and Grand Duchess of Baden, in 1918 when all German monarchies were overthrown.
As Frederick and Hilda were without own direct heirs, they bequeathed their castle of Mainau to Fredrick's only sister's grandson, Count Lennart Bernadotte, who was Hilda's youngest aunt's great-grandson."