From the moment of that sudden vision of herself and God, the saint's interior state seems never to have changed, save by varying in intensity and being accompanied by more or less severe penance, according to what she saw required of her by the Holy Spirit Who guided her incessantly. No one could describe it except herself; but she does so, minutely, in her writings, from which may here be made one short extract: — "[The souls in Purgatory] see all things, not in themselves, nor by themselves, but as they are in God, on whom they are more intent than on their own sufferings. . . . For the least vision they have of God overbalances all woes and all joys that can be conceived. Yet their joy in God does by no means abate their pain. . . . This process of purification to which I see the souls in Purgatory subjected, I feel within myself." (Treatise on Purgatory, xvi, xvii.) For about twenty-five years, Catherine, though frequently making confessions, was unable to open her mind for direction to anyone; but towards the end of her life a Father Marabotti was appointed to be her spiritual guide. To him she explained her states, past and present, in full, and he compiled the "Memoirs" above referred to from his intimate personal knowledge of her. Of the saint's outward life, after this great change, her biographies practically tell us but two facts: that she at last converted her husband who died penitent in 1497; and that both before and after his death — though more entirely after it — she gave herself to the care of the sick in the great Hospital of Genoa, where she eventually became manager and treasurer. She died worn out with labours of body and soul, and consumed, even physically, by the fires of Divine love within her. She was beatified in 1675 by Clement X, but not canonized till 1737, by Clement XII. Meantime, her writings had been examined by the Holy Office and pronounced to contain doctrine that would be enough, in itself, to prove her sanctity.
Text Source: The Catholic Encyclopedia