You asked where Victor Harris Edwards & Catherine Titsworth Edwards were buried.They do not have tombstones with their names on them in any Madison County cemetery.(The Historical Society has published a master index to all tombstones in Madison County)
In looking at the 1860 census records, they were living in Bowen township.By looking at their closest neighbors, I can see that they were living within a mile or so of the town of Aurora, Arkansas.I looked at where their neighbors are buried, and there are three cemeteries: Aurora Cemetery; Henderson Creek Cemetery; and Jackson Creek Cemetery....all of which are within 2 miles of Aurora, Arkansas.
There are no "Edwards" buried in any of those cemeteries.You stated that Victor died about 1858...I show that he died about 1863.He is listed in the 1860 Bowen Township, Madison County census, household #596....as V. H. Edwards, age 61.
I have no information on a second wife of Vardaman Ivie, but he was in the Confederate Army so I doubt very much if a second wife, Martha, received a pension since Confederate pensions were almost non-existant.