Her childhood was marked with polio and she suffered a noticeable limp for the remainder of her life after contracting the disease in 1882 and an operation for pain relief in 1891.
Her desire for the religious life began in her childhood and after being turned from the Sisters of Saint Joseph she managed to be admitted into the Poor Clares where she soon became ill with tuberculosis.
She was permitted to make her vows well before the usual time since she was in poor health.Castang's beatification cause opened on 18 June 1930 and her beatification was celebrated in the Bordeaux Cathedral on 16 September 2007.