The heist happened shortly after 6 a.m. Wednesday at one of the chain's 24-hour diners on the city's southeast side.
Atlanta police spokeswoman Kim Jones says the suspect began acting as an area manager and conducted an inspection of the restroom area, then continued her routine as real area managers do.
The Atlanta Journal-Constitution reports that she also turned the cash register key and took out about $100.
Police say the woman was seen leaving the store in a Mercury Mountaineer SUV with Georgia tags and a male driver behind the wheel.
