At the age of sixteen she had the misfortune to lose her mother. A year afterward her father married again, and through misdirected kindness involved her in a lawsuit, in which she plead her own case and won it; but she left the property with her father, declaring that she cared nothing for it, but only for justice, and that her inheritance might not fall into mercenary hands. She subsequently traveled in Poland, Russia, the Germanic States, Holland, Belgium, France, and England; during which time she witnessed and took part in some interesting and important affairs. While in Berlin she had an interview with the King of Prussia concerning the right of Polish Jews to remain in that city. The Jews of Russian Poland were not permitted to continue in Prussia, unless they could bring forward as security Prussian citizens who were holders of real estate. But even then they could get a permit to tarry only on a visit, and not to transact any business for themselves. Mlle. Potoski, being from Poland and a Jewess, was subject to this disability. Though she could have obtained the requisite security by applying for it, she preferred to stand upon her natural rights as a human being. She remonstrated against the gross injustice of the law, and obtained the right to remain as long as she wished, and to do what she pleased. In Hague, she became acquainted with a very distressing case of a poor sailor, the father of four children, whose wife had been imprisoned for an alleged crime of which he insisted she was innocent. Inquiring into the case, Mlle. Potoski drew up a petition which she personally presented to the King of Holland, and had the satisfaction of seeing the poor woman restored to her family. She was in Paris during the Revolution of July, 1830, and witnessed most of its exciting scenes. On seeing Louis Phillipe presented by Lafayette to the people of Paris from the balcony of the Tuilleries, she remarked to a friend, "That man, as well as Charles X., will one day have good reason to wish himself safely off the throne of France." In England she became acquainted with Lord Grosvenor and family, with Frances Farrar, sister of Oliver Farrar, M.P., the Miss Leeds, and others of the nobility; also with many prominent members of the Society of Friends, among them Joseph Gurney and his sister Elizabeth Fry, the eminent philanthropist, in whose company she visited Newgate Prison. In 1832 she made the acquaintance of Robert Owen, and warmly espoused his principles. In 1834 she presided at the formation of a society called "The Association of all Classes of all Nations, without distinction of sect, sex, party condition, or color." While in England she married William E. Rose, and in the spring of 1836, came to the United States, and resided in the city of New York. Soon after her arrival she commenced lecturing on the evils of the existing social system, the formation of human character, slavery, the rights of woman, and other reform questions.