They then rented "Ellerslie", a mansion near Wilmington, Delaware until 1929. Fitzgerald tried to continue working on his fourth novel, but by this point it had become clear that Zelda had an extreme mental illness as her behavior grew increasingly erratic. In 1930, she was diagnosed with schizophrenia. The couple travelled to Switzerland, where she was treated at a mental clinic. They returned to America in September 1931. In February 1932, she was hospitalized at the Phipps Clinic at Johns Hopkins University in Baltimore, Maryland.