She married Reverend Henry Prittie Perry (the son of Samuel Perry and Hon. Deborah Prittie) in June 1830:
Dublin Weekly Register 12 June 1830, page 7:
MARRIAGE IN HIGH LIFE. —On Tuesday, in St. Peter‘s Church, by the Lord Bishop of Ossory, the Rev. Henry Prettie Perry, second son the late Samuel Perry, Esq., of Woodrooff, county of Tipperary, to Catherine, youngest daughter of the Hon. and Right Rev. the Lord Bishop of Waterford, and niece to the Earl of Mayo.[1]
They went on to have at least eight children:
Henry Robert (b. circa 1831, d. 24 Aug 1903)
Samuel William Prittie (b. circa 1831, d. 14 Aug 1898)
Frances (b. circa 1833, d. 2 Jun 1898 unmarried)
Richard Robert (b. 15 Jan 1834, d. Mar 1834)
Katherine Mildred Selina (b. 20 Aug 1835, d. 3 Feb 1912 unmarried)
Adelaide Anne Villiers (b. 13 June 1837, d. 25 May 1912)
Arabella (b. 2 Aug 1839, d. 30 Mar 1912 unmarried)
Louisa (b. 9 Jan 1841, d. 1919)
Her husband died in 1870.
She passed away in 1876 at the age of about 72[2].
Northern Whig 16 September 1876, Page 5:
DEATH OF LADY KATHERINE PERRY.- The death is announced of Lady Katherine Perry, aunt of the late Earl of Mayo, Viceroy of India. Her Ladyship was the third daughter of the late Hon. Richard Bourke, Bishop of Waterford and Limerick, by the daughter of the late Archbishop Fowler, of Dublin, and was born in 1804. She married, in 1820, the Rev. Henry Pretty Perry, Rector of Tullamehan, Tipperary, who died a short time since. Lady Katherine Perry was raised to the rank of an Earl's daughter by Royal warrant in 1840.[3]