Could her maiden name have been Pidoux? No other explanation of a statement that her husband's brother-in-law was Egrège Jaques Pidoux (1618) seems possible. Further, there is the problem of how a house at No. 9 Rue du Temple (demolished in 1961) passed from François Pidoux in the mid-16th Century to Jean Decristaz about 1660. Could it have passed from Pidoux to a Dutoit, and then through his daughter Marie Dutoit to her husband Jean Decristaz?
Her will is in book "FF 6", p. 44, Cecil Co., MD, dated 05 oct 1795. The will mentions land callled "McCay's Purchase", on the Susquehannah River. Heirs are son William, daughter Easter wife of Robert Rowland, daughter Ann wife of Robert Love, son John McCoy junior, daughter Margaret Gordin, daughter Jean wife of Peter Nossinger, unmarried daughters Agnes, Elizabeth, Frances, and Catrain (Catherine). The residual heir was her son James McCay, presumably the eldest son.