She and her husband became increasingly convinced that her grandmother Mabel, the earl's wife, had forged the will in the interest of her sons, Lettice's uncles.
[1] Meanwhile, Robert was knighted in Dublin on 4 August 1599 by the Earl of Essex, Lord Lieutenant of Ireland and his wife's first cousin.
During the reign of James I, Digby assisted Sir Richard Verney, then High Sheriff of Warwickshire, in apprehending some of those involved in the Gunpowder Plot in November 1605.
The expenses of litigation had impaired his estate, and he was forced in his will to ask her to provide settlements for their children from the revenues of her Irish lands and a sum of money held by his brother.
A settlement was finally achieved in July 1620: Lettice was created Baroness Offaly for life, with remainder to her grandfather's heirs male, and received the manor of Geashill, with 30,000 acres of land, for herself and her children.