John M. Floyd of Tishomingo County,MS

I am looking for the 2nd wife of John M. Floyd.John was born Oct.17,1832 in SC.His parents were John and Margaret R. Floyd.His 1st wife was Nancy Milford.They married on January 21,1856.I don't know what happened to Nancy.John M. and 2nd wife Mary Ann ? married on March 8,1866.I have confusing info on Mary.I found info one place that showed John M. married the widow of his 1st cousin William Jasper Floyd,Sr.Her name was Mary Ann Thompson.William Jasper,Sr and Mary Ann had one child, William Jasper,Jr.William,Sr died and Mary Ann married Thomas Watts.She is on the 1900 Lee Co,MS census listed as Mary Watts mother of William Jasper Floyd,Jr. I know that John M. married Mary Ann ? because I have the papers where she signed up to draw his pension.If anyone has any knowledge on who the Mary was that John M. married PLEASE contact me.
Thanks,
Karen