Isolated Mary Featherstone grave found in NM-d. 1883

A friend of mine found this about 20 years ago along the trail west. It was fenced off. Thought maybe she died on the trail and perhaps no record is found.
A lone grave at Marcell, NM. Near a church, lists this Name: MaryA. Featherstone. died 30 May 1883, Age 51. M: G, W. Featherstone.
Note Issaqulena, MS.

I assume this means she came from MS.
I tried to find both of these names in GNIS and couldn't find out what county they were in.