Her gravesite may be difficult to find if she does not have a grave marker. This is a listing for a telephone number for Cosmopolitan Funeral Home, Memphis: 800 525-4146
I would suggest you call them. They can even tell you the location of the grave, lot and section number, and especially where the cemetery is located, IF you reach a congenial and cooperative clerk... and they usually are. Good luck. Let us know your results.