Her world-famous bird hospital was first established at Les Cordeliers in the Grange, where she lived with her companion Nell Littlefield. To pay for the birds' feed she used to make shell animals and sell them at the market. During the German occupation of the Channel Islands she carried on with the bird hospital and a German officer often helped with food. After the Occupation Marjorie Ozanne gave up teaching and moved to Bon Air, Les Adams, L'Eree, where she continued to run the bird hospital until her death in 1973. "The hospital became internationally known after the Occupation ended and it was perhaps the first of its kind in the world." Her work at the bird hospital was shown on British television.