If Nancy lived in Mississippi as a child this could be her family and birthdates coincide with other researcher's information. I found this on another free site: FamilySearch.org I am pretty sure this is the correct Nancy since it is the same county you listed.
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"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9F8-5BM : accessed 27 Oct 2012), Nancy E Guthrie in household of James A Guthrie, ED 113 Beat 4 (western half), Wayne, Mississippi, United States; citing sheet 11A, family 168, NARA microfilm publication T623, FHL microfilm 1240833.
It lists the family as:
All living in: ED 113 Beat 4 (western half), Wayne, Mississippi, United States for the US Census 1900.