Bridget Anne Kelly, the former deputy chief of staff for then-Gov. Chris Christie, was sentenced Wednesday to 13 months behind bars for her role in a scheme to punish the mayor of Fort Lee by misusing Port Authority resources to cause traffic problems in the borough and ultimately covering it up.

The sentence imposed by U.S. District Judge Susan D. Wigenton for the District of New Jersey in Newark shaved five months from Kelly’s original sentence of 18 months.