Large land grants were made in the 1790's in now Hampshire, Berkeley, and Greenbrier County to several Abernathys: John (406 acres Hampshire County on 9 Dec 1791), James (10 grants Greenbriar county, 7th, 17th & 18th of Jun 1795 for a total of 23,335 acres), James (Berkeley County which then encompassed what is now Morgan County, 16 Apr 1799 of 1796 acres).
Abernathy taxpayers in Hampshire County in 1803 include James, William Sr, William Jr, Samuel Sr, Samuel Jr, John Sr, and John Jr. Most (or widows) are still there as late as 1813, after which I have no tax records fot that area.
Check ancestry.com for additional details.
Sorry, but I don't have Elizabeth Wagner Abernathy in my database yet. But I would surmise that she was one of the Irish originating Abernathy line that remained in that area until at least the 1880's.