Denson wanted all NDAs from the campaign invalidated because she felt it kept employees from alerting workplace misconduct.
Jessica Denson, an actress who worked for the campaign, was required to pay it $52,230 for breaching the agreement, Bloomberg News reported.
She sued in federal court to void the NDA in 2016 so she could carry out a separate suit alleging superiors harassed and defamed her.
Denson sued for $25 million in damages in 2017 over claims including the alleged harassment. The Trump campaign made a $1.5 million arbitration claim, saying she had gone against the NDA.
Federal Judge Jesse Furman ruled in August that the case would be arbitrated, and the arbitrator gave the campaign $49,508 plus interest. This was held up in state court in Manhattan. Furman on Tuesday upheld the state court decision despite a request from Denson to toss it.