No locate on Nancy in particular. Might try the DeBaca County Clerk's office to see if they have a record. I could not find her on New Mexico Death Index but that does not mean she did not pass away in New Mexico.
Found a James Bennett Bowli; Sarah Lillie Bowlin, Joe Raleigh Bowlin; John Henry Bowlin in the the Anal CEmetery, a few miles away from Ft. Sumner. There are many unmarked graves in this cemetery; possibly one of them could be Nancy.