In 2007, Eaton completed her first season racing cars, in the SAXMAX Championship at various tracks around the United Kingdom with a highest position of fourth place. In 2008, Eaton returned to the SAXMAX championship and led for most of the year but ended in fourth place, with three podiums and two fastest laps.

In 2009, Eaton moved into her first year of adult car racing in the Production Touring Car Championship, driving a Vauxhall Corsa SRi-R. She won the class B championship outright with 15/18 wins, sixteen podium positions, and seven fastest laps, finishing second overall in the championship.

In 2010, Eaton was without a team when her British GT debut fell through a few weeks before the season was due to start. However, she did manage to make one race in the Mazda MX-5 Mk1 championship, finishing third out of over 90 entries.

In 2011, Eaton raced a rear-wheel Mazda MX-5 Cup car. After a tough season missing several rounds due to a lack of budget, Eaton managed to achieve eleven top-ten finishes and a highest qualifying coming third.

Eaton competed in a handful of races in the 2012 Mazda MX-5 Cup, but had to withdraw owing to family circumstances.

In 2013, Eaton raced in the last three races of the Mazda MX-5 SuperCup with a win, two second places, one third and one fourth. She also raced in the Autumn Challenge and achieved two second places.

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.

Eaton appeared on ITV's Drive in 2015, coaching Rapper Professor Green in various racing car challenges over a five-week period. This included mud buggy, stock car, and Sports car races. Eaton and Professor Green were the most successful pairing, staying out of the eliminator night race and making it through to the final round. Eaton and Professor Green were crowned champions in the last episode.

In 2016, Eaton moved to the British GT Championship in a Maserati Granturismo MC GT4, the first time that Maserati had been in the British GT for over 20 years. She shared driving duties with Marcus Hoggarth, and their team placed second in the Pro/Am Championship and fourth overall.

Eaton also stars as the test driver for the second series of the British motoring show The Grand Tour, replacing the previous first series test driver Mike Skinner. James May stated in November 2017 that a large number of drivers had been tested, and that "she was the fastest and the best". Eaton was later introduced to the show in the second episode of the second series, on 15 December 2017, when she was shown testing a green Mercedes-AMG GT R around the Eboladrome test track. In the Mercedes, Eaton says "Right, here we go" to herself, before starting the lap and completing the test drive silently. Eaton did not have her name mentioned at all throughout the episode, only being referred to as "she", and her name was only shown in the credits at the end of the episode, credited as "driver".

In April 2018, Eaton was interviewed by Red Bull around her work on The Grand Tour.