On second thought, It would probably be better, for now, to concentrate on finding Mary Louraine Cleveland, especially since you have her full date of death. Most likely there was an obit for her, and most defintely a death certificate filed with the state.Maybe, ifyou find her grave, the others will be in the same cemetery. If it were me, and it wasn't too far to travel, I would drop by the public library in Starke, and do a search for an obit for Mary Louraine. Of course, the other option is to send off for her death certificate.
It's certainly possible there wasn't a death certificate for Jessie Franklin filed with the state, and right now you don't have enough info on Iona to order a death certificate, or search for an obit.