Hopewell Friends History, 1734-1934 Frederick County, Virginia has been oft cited for the births of James and Mary Wright. I was able to search the book courtesy of Google books and discovered that a digital copy is available on familysearch.org's catalog. That being said, p. 487 of the book offers the following:
Wright, James: b. 1671 [no marriage or death date given]
w, Mary: b. 2 - 12 - 1689 [no marriage or death dates given]
( In Quaker records 12th moth is February, not December.)
The births of the 11 Wright children follow there entries.
At this point, the dates confirm the most frequent year of birth given for James and the most common date given for Mary. It also backs up Baldwin's statement that Mary Bowater's birthdate was one day off from that of Mrs. Wright. More study needs to be given to the book, although there are only two pages referencing Mary.