I noticed that there's a school in this screenshot of where JD was found. I decided to look it up and see if any yearbooks were available, as it's a k-12 school. Thanks to Classmates.com I've been looking through photos of kids K-5 throughout the 70s. It looks like kindergarteners were allowed to wear whatever, and grades 1+ had a uniform. I found a girl who looks like the girl in the picture in the 1974 yearbook, I can't tell exactly but based on the chronological order of the photos, I'd guess grade 1 or 2 (she's in a uniform.)
I can only zoom in so much, and I'm no facial recognition expert, but I am finding real similarities in the length of eyebrows, smile squint, cheeks, hairline/part, and shape of teeth. I googled her name, but can't find anything on her; she likely has a married name now.
I googled Pam & Dwight (girl's last name) Atlanta to see what came up, and I was able to find an obit for a Dwight with the same last name who was originally from Athens GA and seems to have a last known address in suburbs of Atlanta. Although this is a fairly common last name, he would be in the right age range if we were considering Pam & Dwight to be this girl's parents. The obituaries I can find are very limited and don't offer any other family names (such as wife or kids.)
Not sure where to go from here...