The incident happened Tuesday in Charlotte, where temperatures were well into the 80s.
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According to WSOC, an employee in the parking lot called 911 after spotting the kids in the car.
Workers said a maintenance man then went through the office building to find the 27-year-old mother.
Man left 3-year-old in hot car for hours while in NJ restaurant, police say
Officials said the children were five months, two years and four years old.
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"Saw paramedics taking the babies into the ambulance," witness Jackie Pennie told WSOC. "Just that alone was upsetting."
Officials said the children were OK. The woman was cited for neglect.
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