3 I come now to the life which after her twelfth year she, by her own exertion, chose, laid hold of, held fast to, entered upon, and fulfilled. Shut up in her narrow cell she roamed through paradise. Fasting was her recreation and hunger her refreshment. If she took food it was not from love of eating, but because of bodily exhaustion; and the bread and salt and cold water to which she restricted herself sharpened her appetite more than they appeased it.
But I have almost forgotten to mention that of which I should have spoken first. When her resolution was still fresh she took her gold necklace made in the lamprey pattern (so called because bars of metal are linked together so as to form a flexible chain), and sold it without her parents' knowledge. Then putting on a dark dress such as her mother had never been willing that she should wear, she concluded her pious enterprise by consecrating herself immediately to the Lord. She thus showed her relatives that they need hope to wring no farther concessions from one who, by her very dress, had condemned the world.
Source: Letters (New Advent)