Peternell probably married Luke Tregidgwan, son of Thomas Tregidgeon and Pasca, by 1667. (Luke Tregidgwan was born about 1635 and was buried on 20 Oct 1684 in Kea, Cornwall.)
Sources
1
Luke's eldest daughter, Mary Tregidian, was christened in Kea on 8 Mar 1667/8.