Rose Rourke/O'Rourke to Australia 1848

I am looking for more information on Rose Rourke who I believe arrived in Australia 13 Dec 1848 aboard the "Lady Kennaway" aged 16. She is likely to have been part of the Pauper/Orphan Emigration Program. 

I have conflicting information: emigration information has her Native Place as Tuam, Galway and her Australian marriage certificate and childrens records have her place of birth as County Sligo. 

I have no record of her parents. 

She married William Whittaker (1831-1870) on 25 Aug 1853 in Kilmore, Victoria, Australia and gave birth to atleast 6 children. Four of her children were George (1861-1924) my Great Grandfather, James (1864-), Emma (1867-) and William (1853-1916). Rose died on 24 Oct 1900 at Whiteheads Creek, Seymour, Victoria. 

I would really appreciate any information on Rose's ancestry.