My great grandmother

I have run up against a stone wall in my search for my great grandmother Tipton. The only name I know is "Nettie", she married my great grandfather Edmond Pinkney Harrelson about 1889 in Alabama or Florida. She is on the 1890 Florida census and the 1900, but she died shortly after the census was conducted. My grandmother, Fannie Lou Harrelson Hart, was born in 1892 and was 8 years old when her mother died. Great Grandpa Harrelson soon remarried Luretha Harrelson Robbins Harrelson and they had a large family together. I believe my great grandmother died in the panhandle part of Florida, perhaps Bay County, Panama City or Covington County, Alabama, but I've never been able to find a birth, marriage, death record or a headstone. Might anyone be able to assist me in finding her?