Cause of her death was Died in childbirth.
Extract from "The Ash MSS, written in the year 1735, by Lieut. Colonel Thomas Ash", published by Henry Tyler (1890)
Thomasin married John ASHE of Cornerrin, later Ashbrook, son of Josias ASHE and Mary HOGAN. (John ASHE of Cornerrin, later Ashbrook died in Nov 1684.)