Susan was married to her step-brother John Martin. The 1620 Visitation wrongly shows Susan's mother as mother of John Martin, but she was actually John's step-mother (not his mother).
Name
Name: Suzan /Hemertin/
Burial
Date: 24 july 1628
Devonshire, England
Note
VISITATION OF DEVON
Sources
"England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N2SB-6ZZ : 10 December 2014), John Martyn and Susan Hemerkyn, 22 Jul 1610; citing Saint Andrew,Plymouth,Devon,England, reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 481,081, 823,684.
In the biography section, it says she died 10 Sep 1623, Dover, New Hampshire. The place is definitely wrong, and I could find no source for that date.
She and John apparently had a daughter Lydia born in 1627. And the following source says Susan was buried in 1628 (but not sure how good a source it is):
"England, Devon, Parish Registers, 1538-1912," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KC9D-ZX9 : 4 November 2017), Susan Martyn, 1628, Burial; from "Church of England parish registers 1538-1911," database and images, findmypast (http://www.findmypast.com : n.d.); citing Devon, archive reference , images provided by FamilySearch International.
She and John apparently had a daughter Lydia born in 1627. And the following source says Susan was buried in 1628 (but not sure how good a source it is): "England, Devon, Parish Registers, 1538-1912," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KC9D-ZX9 : 4 November 2017), Susan Martyn, 1628, Burial; from "Church of England parish registers 1538-1911," database and images, findmypast (http://www.findmypast.com : n.d.); citing Devon, archive reference , images provided by FamilySearch International.