I do apologize for the very belated reply to your message concerning Elizabeth Abernathy on the 1850 Weakley County TN Census report.
However, while I know who Elizabeth Dickerson was married to, I have a problem with 2 of the children you attribute to her. Her husband was Ephraim Perkins Abernathy, who was last found on the 1840 census in Weakley County TN. He died intestate, about 1843 as an authorization was granted to G. W. Cavitt for the administration of the deceased's estate in that year (Weakley County Will Book B, p. 40). Son Thomas could have been his, but it seems doubtful that daughter Missouri or son John were.