I checked the San Diego Union newspaper in both the obituary section and the 'Death & Burial' notices in the classified ad section. According to the CA Death Index she died on Oct. 4, 1928. On Oct. 5th I found the following;
NEFF -- In this city, October 4, 1928, Emma Neff, mother of Hugh Neff and Mrs. Nora Suschanke of San Diego. J. F. Neff of Potean, Okla.; a native of Ill., aged 58 years, 11 months and 28 days. A member of the San Diego Lodge No. 8 Fraternal Brotherhood. Announcement of funeral services will be made later by the Benbough Funeral Parlors, corner Seventh and Date streets.
The following day, this was added to the above;
Friends and members of the Fraternal Brotherhood are invited to attend the funeral services to be held at the Benbough Funeral Home, cornerSeventh and Date streets, tomorrow (Monday) at 2 pm under the auspices of Local Fraternal Brotherhood lodge No. 18. Entombment Benbough Memorial Mauselium.