In 2014, Eaton returned to the British Racing and Sports Car Club (BRSCC) Mazda MX-5 Supercup Championship for the last time. Despite car troubles early in the season, Eaton went on to achieve five wins, seven podium finishes, six fastest laps, two pole positions, and a new lap record. She was crowned the 2014 Mazda MX-5 Supercup Champion. During a race at the Anglesey Circuit, she qualified on pole position eight-tenths of a second ahead of second placed position, and went on to win, set the fastest lap, and then set a new lap record, all within three races.