I found more information about your great grandmother.
The 1900 census shows her parents and 4 siblings.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3JF-MD2 : accessed 25 December 2017), Julia Allison in household of John Allison, Militia Districts 999, 1551, 1116, Crumbys, Porter Springs, Chestatee, Lumpkin, Georgia, United States; citing enumeration district (ED) 99, sheet 3A, family 41, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,209.
Other records are:
- "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML2J-HM5 : accessed 25 December 2017), Julia A Ellison in household of John N Ellison, Frogtown, Lumpkin, Georgia, United States; citing enumeration district (ED) ED 114, sheet 1A, family 2, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 199; FHL microfilm 1,374,212.
- Find a Grave, https://www.findagrave.com/memorial/31605829 (has photo of headstone)
I also see that you created 2 profiles for her husband that need to be merged. It will not be easy to find information for any other family members, since their profiles are all private.