Pfund underwent surgery in mid-2016 due to two torn ligaments in her right foot and returned to the ice three months later.[6] She and Santillan finished 8th at the 2016 Cup of China. Following the event, she had an amniotic stem cell injection to treat tendinitis in her anterior tendon and a bone cement injection for a chronic bruise in her talus bone.[6] In January 2017, Santillan had a strained rotator cuff in his right shoulder.[6] The pair placed 5th at the 2017 U.S. Championships.
In October 2020, Pfund and Santillan announced their intention to represent Switzerland in competition, but were told by the U.S. Figure Skating Federation that they would have to wait a year to be released.[7] In July 2021, they announced they were allowed to represent Switzerland for the 2021-2022 season.[8]
On March 18, 2022, they announced their retirement from competitive skating.[9]
During the competition control at the Elite Swiss Championships 2021, Pfund tested positive for the prohibited substances amphetamine, cocaine, and metabolites. After notification by Swiss Sport Integrity, the Pfund was unable to present an exception permit for therapeutic use (ATZ) of the medication containing amphetamine and as of May 3, 2023, she has been sentenced by the Swiss Sports Disciplinary Chamber (DK) to a four-year suspension for the presence and use of prohibited substances in competition. The suspension took effective on January 6, 2022 and is valid for all sports and any functions in sports worldwide. In addition, Pfund must pay control, analysis and procedure costs, compensation to Swiss Sport Integrity, and a fine in the total amount of CHF 4,210.[10][11]
