Naw I don't believe it was a scam. People are just idiots. For some reason they like to hop out of their car with the keys in the ignition and walk away. I see it aaaaaaall the time here in ATL.
My ex and I had a car together. She did the exact same thing this woman did and the car was stolen. Right off Bouldercrest and Flat Schoals.
I use the nextdoor app and there's always people making posts about how they left their cars with the keys in the ignition and their cars were stolen. Usually at the gas station