Chadwick also competed in race 9 of the 2016 VLN season, driving the Nexcel AMR Aston Martin GT8 and finishing third in the SP8 class.

[15] Chadwick also entered the 2018 24 Hours of Nürburgring, driving the Aston Martin Vantage V8 GT4 in the SP8 class alongside Jonathan Adam, Alex Lynn and Pete Cate.

[16] Chadwick proceeded to sign on for the 2018-19 MRF Challenge season in November 2018, and topped both initial practice sessions.

[19][20] Chadwick was also announced as an official junior driver for Aston Martin Racing, extending an existing unofficial relationship that dated back to 2014.

[21] At the first W Series race at Hockenheim, Chadwick put in a dominant performance, leading both practice sessions and qualifying on pole.

Despite briefly giving up the race lead to Alice Powell, Chadwick came from behind to take the first win in W Series history.

[27] Chadwick entered the W Series championship decider at Brands Hatch with a 13 point lead on second placed Visser, and proceeded to start on pole for the third time.

She also entered the 2019 24 Hours of Nürburgring with Aston Martin, racing alongside Alex Brundle finishing first in the SP8 class and twenty-seventh overall.

[40] On 16 June 2020, it was announced that she had joined Italian outfit Prema Powerteam, to be one of the team's four drivers in the 2020 Formula Regional European Championship.

[57] In August 2022, Andretti Autosport announced that they planned to test Chadwick in one of the team's Dallara IL-15 Indy Lights cars at Sebring International Raceway in September 2022.

[59] Subsequently, it was announced on 1 December 2022 that Andretti Autosport had signed Chadwick to drive in the 2023 Indy NXT season.

[60] Inexperience with both the car and the tracks meant Chadwick struggled to get up to speed, but she improved in the second half of the season earning five top-10 finishes over the final 8 races.

[63] Chadwick fought in the front of the pack for the first races, but contact and mechanical issues meant she didn't achieve results representative of her pace.

[64] Chadwick scored her best result to date in race 3 at the Indianapolis Motor Speedway, finishing on the podium in third place.

[66] On July 31, 2024, it was announced that Chadwick would be taking part in an official IndyCar test with Andretti Global at Barber Motosports Park on September 30.

[67] In December 2024, Chadwick signed with IDEC Sport for the 2025 European Le Mans Series, driving alongside Logan Sargeant and Mathys Jaubert.

[68] The team is run in collaboration with Genesis Magma Racing, as the latter prepares for a Le Mans Hypercar debut in the 2026 FIA World Endurance Championship.