Considering there is a forest near the location she was last seen, there’s a chance that she may have gotten lost or harmed in that forest. Though this case is old, this may be a bit useless, but I’d like to help if it’s still open.
From what this case says, Betty was last seen at (34.06392, -84.6881), Lake Acworth Dr. Near the exact coordinates are two places I find interest in: 4498 Lake Acworth Dr, Acworth, GA 30101, and the exact coordinates she was last seen; (34.06392, -84.6881).
Balancing the possibilities of being lost or being kidnapped, she has either been kidnapped by the staff members of John Andrew Flooring & Restoration OR she has gotten lost in the forest near the location of interest.
There are no other clues, however, so I cannot help anymore. I hope this is useful for you all.