[1] She had three brothers and one sister but they were all declared insane so in 1638 when her father died she inherited Shane's Castle and his Edenduffcarrick estate in County Antrim.
A committed Catholic Antrim had been one of the largest and wealthiest landowners in Ireland, but his free-spending had run him heavily into debt and his problems had been compounded by the Irish Rebellion of 1641.
Following the Cromwellian conquest of Ireland, Antrim was left suddenly exposed and tried to gain favour with the new regime.
Because she was a Protestant and brought some assets such as land in Toome to the marriage, she boosted Antrim's credit with the Cromwellian authorities.
Rose worked very hard to clear her husband's name, mortgaging her estates to raise money for his legal fees and wrote numerous letters to Charles II and other influential figures lobbying them on his behalf.