The caption for this image (slightly edited without changing content) is a good summary for her, "Princess Marie Louise of Schleswig-Holstein (1872 - 1956), younger daughter of Princess Helena and Prince Christian of Schleswig-Holstein. Featured in the Lady's Realm, that run an editorial describing her artistic tastes and tendencies and her talent for enamel work. Marie Louise was unhappily married to Prince Aribert of Anhalt, but the marriage was dissolved. She spent the rest of her life unmarried, was an active member of the royal family, and published her memoirs, My Memories of Six Reigns in the 1950s." Her Wikipedia article is here.