Martha Ann Grayson Blount md William Henry Isham

Did the wife of Frederick Quincy Blount (Martha Ann Grayson) remarry after his death in 1892?I have a William Henry Isham who married Martha A. Blount in 1894 in Hunt County, TX.In the 1900 census William Henry Isham and Martha have a stepdaughter in their home named Martha Blount.However, Martha is buried as a Blount in Sulphur, Murray, Oklahoma.Any help would be appreciated.