The offer would have seen the singer placed on a year's probation and fined $150 (£87) for allegedly driving without a valid licence, reports The Associated Press.
However, the 26-year-old's legal representative J. Michael Flanagan wants a lesser fine and a reduction to the charge.
Should the case go to trial, the attorney said he will appeal any conviction, claiming that Spears is being unfairly targeted because of her status.
The charge relates to an incident in August 2007 when it is claimed Spears bumped another vehicle and left without leaving a note.
The star was charged with misdemeanor hit-and-run and driving without a valid licence. The hit-and-run charges were later dropped after Spears paid an undisclosed sum to the car's owner.