Named in her husband's Will (1650) as deceased. William married for a third time to Dorothy Jones (née Vaughan) whose first husband, Rev. Maurice Jones, died in 1641. As William and Dorothy had two daughters, Katherine would've died no later than the mid-1640s.
Marriage Information:
Katherine married William Anwyl of Dolfriog, Gent., son of Morris Lewis Anwyl of Nantmor, Gent. and Elizabeth William. (William Anwyl was born about 1608 in Beddelgert, Caernarvon, Wales and died between 31 May 1650 and 18 Oct 1650.)
Sources
1Pedigrees of Anglesey and Caernarvonshire families, J. E. Griffith, p. 320.