 In the same year she also donated the 1918 Picasso painting of her grandmother and mother to the Musée Picasso in Paris.In 2012, German tax authorities found pieces from Rosenberg's collection in an apartment owned by Cornelius Gurlitt, son of 1930s German art dealer Hildebrand Gurlitt, in Schwabing, Munich.Over 1,500 pieces were recovered with an estimated value of up to €1bn, including "Portrait of a Woman" by Matisse that Rosenberg had left behind after fleeing Paris.