Mershon Family Genealogy Forum
The information you found on the Internet is essentially what is in our Mershon Family database; and it also agrees with the data for the family of Daniel and Effie (Hamilton) Mershon--5 sons + 1 daughter (Fannie). No Martha. However, our data says that Daniel and Effie had Benjamin (b. about 1802), Nathaniel (born about 1803), then Elias Truitt (b. 1811). That is a big gap in child bearing, so there may have been other children, including your Martha.
Why don't you contact Earl Mershon (ECMershon@aol.com), as he is a descendant of Elias Truitt (above)? He may be able to help you.