Wagner's two Grand Prix assignments for the 2015–16 season were 2015 Skate Canada International and 2015 NHK Trophy. She began her season by winning the gold medal at Skate Canada. She then went onto placing 4th at the NHK Trophy. Those results qualified her for the 2015–16 Grand Prix Final. At the Final she placed 6th in the short program, third in the free skate, and 4th place overall. At the 2016 U.S. Championships, Wagner was awarded the bronze medal behind Gracie Gold and Polina Edmunds.