Looking for Lehan of Cork Ireland and Yonkers New York USA

Julia LEHAN was my g-g-grandmother. She was born in County Cork (parents' names unknown) circa 1825. On Sept. 15, 1849, she married John CHINNERY, also of Co. Cork, b. circa 1825. Marriage site is unknown, presumably in Co. Cork and presumably Catholic. The couple moved to Wales, where their four children were born between 1850 and 1859: James, John, Catherine and Michael. John CHINNERY supposedly died in Wales; subsequently, JULIA LEHAN CHINNERY emigrated to NYC with her children (about 1860). She moved to Yonkers, Westchester County, New York, where I found her in the 1870 census with the four children. I did not find her in the 1880 census, and Yonkers civil records of deaths only started in 1876, so I'm presuming Julia died between 1870 and 1876. In 1879 her son MICHAEL CHINNERY married MARY GREELEY (GRALY)in St. Joseph RC Church in Yonkers. I have information on that generation of Chinnerys. I would like to know more about Julia (death date, burial location and names of parents, and siblings if any, plus village or town of birth in County Cork).