In the 1900 census for Daniel and Ellie Ann Cross, thier neighbors are Marion and Elizabeth Stuart. Which are the names of Ellie's parents on her profile. I believe these neigbors might be Ellie's family. In this family's1880 cenus, there is a daughter listed as Anna. She's a few years older than the age you have for Ellie Ann though. And the parents birthplace is North Carolina. But from looking at the siblings later census records, they thought their parents were born in Tennessee.
I realize it's a different direction. But your question indicated you weren't sure about Ellie Ann's origins. And the mother Elizabeth Stuart's maiden name may have been Canup. Does any of this sound familier?
Here are their 1880 and 1990 census records.
United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDWQ-4RR : 13 July 2016), Marion Stuart, District 7, Polk, Tennessee, United States; citing enumeration district ED 99, sheet 71A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1275; FHL microfilm 1,255,275.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSCR-T7S : accessed 21 January 2017), Marion Stuart, Civil Districts 7-8 Turtletown village, Polk, Tennessee, United States; citing enumeration district (ED) 128, sheet 3A, family 48, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,592.