In 1850, Isabella married Colonel Frederick Charles Trench of Woodlawn, County Galway, Ireland.
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The Oliver Gascoigne family originated at the point that Richard Oliver, originally of Castle Oliver, Limerick, Ireland, inherited the fortune of Sir Thomas Gascoigne of Parlington Hall, Yorkshire, in 1810.
His widow remarried Sir Thomas Gascoigne, 8th Baronet of Parlington Hall, Aberford and their daughter Mary inherited the Gascoigne's Parlington estate.
He supported the cause of American Independence and built a commemorative arch to the American Victory in the War of Independence, thought to be modelled on the Arch of Constantine in Rome, at the entrance to his Parlington Hall estate.