What causes did Dorothea Dix promote in the early 19th century

Dorothea Dix promoted and established the Asylum Movement, where mental institutions where created and health and hygiene in prisons was improved. This came after Dorothea visited and documented the treatment of prisoners and the living conditions within the prisons, both public and private. When she released her findings it shocked the general public, which lead to old hospitals being redesigned and repurposed for the use of mental facilities. The hospitals were built according to Dorothea's designs and with her guidance, there is now a widespread movement to reform the treatment of the mentally ill.