Dear Stephanie Carnes,
Thank you for posting your request on History Hub!
The Bureau of Indian Affairs has compiled a guide titled “A Guide to Tracing American Indian & Alaska Native Ancestry” that may be useful to you. NARA’s Native American Heritage, NARA’s Resources for Genealogists, and the FamilySearch Research wiki for Indigenous Peoples of the United States Genealogy may also help. You may be interested in the resources my colleagues and other researchers discuss in such previous History Hub posts as https://historyhub.history.gov/thread/9765 as well.
In addition, we searched the National Archives Catalog and located the Applications for Enrollment in the Five Civilized Tribes, 1898 - 1914 (also known as the Dawes Rolls) in the Records of the Bureau of Indian Affairs (Record Group 75) that may include the name of your great grandmother. Most of these records have been digitized and are available using the Catalog. For more information about the non-digitized records, please contact the National Archives at Fort Worth (RM-FW) at firstname.lastname@example.org.
We suggest that you review the NARA web page for Dawes Rolls as an overview of how to research that resource.
We hope this is helpful. Best of luck with your family research!