The GREENWOOD1 and GREENWOOD2 files explain the location of Fanny's grave.

GREENWOOD1: (Block 20) Fannie is buried above Josie and Harris Slaughter.

GREENWOOD2: (Space 11) Adult Grave is found above the Slaughter children.

Fannie was murdered in September 1884 and her grave was lost until 2001.

I have copies of all the newspaper articles on it if you want them too.