She couldn't be found in the Florida Death Index because she died in Macon, Georgia. Here is the complete obituary and funeral notice:
"Mrs. Martha Crawford Brown, 84, of Macon, Ga., widow of Thomas H. Brown, died in Macon Sunday at the residence of her daughter, Mrs. Prentice Edwards. A native of Washington, Tenn., she resided in Tampa from 1921 until 1935, when she moved to Macon. Mrs. Brown is also survived by another daughter, Miss Mary E. Brown, Tampa; a son, J. Crawford Brown, Orlando; four grandchildren and five great-grandchildren."
"Mrs. Martha Crawford Brown, age 84, of Macon, Ga., former Tampa resident, passed away in that city on Sunday. The remains will be interred in Myrtle Hill Cemetery at 2 o'clock Thursday afternoon, with Dr. L.D. Patterson officiating. F.T. Blount Co in charge of arrangements. THE FAMILY HAS REQUESTED PLEASE OMIT FLOWERS."