How to find information on ancestors?

I have tried all genealogical databses, went to my local courthouse and library, newspapers. asked older relatives, and have been on gen forum, lds..etc. this was my great great grandmother, all i have are her first initials and last name. I know where she is buried and it has no grave marker, and the old cemetery records weren't kept ehn she died. Any one have anyother ideas? and yes I have checked census also.