It appears that Catherine and her husband, Michael Devine, emigrated from Ireland (probably from Kerry) to England in the 1820s with at least one child (Daniel). At least three more children were born in the parish of St. Giles-in-the-Fields in London prior to the family's move to Kensington in the late 1830s. They were living at 19 Young St. in Kensington in 1839 when their daughter Elizabeth was born; and according to the 1851 census they were living at 2 Market Court, also in Kensington. The 1961 census tells us that a widowed Catherine was still at 2 Market Court and living with her unmarried sons, Michael and John, and Michael, the 10-year-old son of her other son, Daniel who had probably died by that time. Catherine's occupation at the time of the 1861 census was "Small Shop Keeper". Given the approximately seven-year gap below between the births of the first and second of their children listed below, I think it likely that Catherine and Michael had more children between 1822 and 1829.
Built in the 1770s, Market Court, no longer in existence, was one of a number of slums or 'rookeries' located off the south side of Kensington High St. Young St. is also located off the south side of Kensington High St. and very close to Market Court so it is possible that Young St. too was a slum. There was a high concentration of Irish people living at this time in the slums of Kensington, most of which, Market Court included, were eventually demolished in the late 1860s.
In the 18th and 19th centuries, St Giles, where Catherine, Michael and their family lived before they moved to Kensington, became one of the main areas of Irish settlement in London. One of London's most notorious rookeries was located there and was known as 'Little Dublin' and 'The Holy Land' because of the large number of Irish who lived there. Given that the Devine family lived in a slum in Kensington after their move from St. Giles, it seems likely they lived in the rookeries when they lived in St. Giles.
According to her death certificate Catherine died of bronchitis and senile decay. The certificate shows the informant to have been an Ellen Cummins of 7 Holland St.