race. On November 30, 2018, DGR-Crosley announced plans for Decker to run a partial Truck Series schedule for the team in the 2019 season, along with some ARCA and K&N Pro Series events. Decker's Truck series debut at Daytona saw her No. 54 Toyota cut a left front tire and rupture an oil line, setting the truck on fire on the first lap. At Kentucky Speedway in July, Decker was involved in an on-track incident with Spencer Boyd, eliminating both drivers from the race. Later, in the truck garage, Decker took Boyd’s hat off his head and slammed it on the ground before being verbally warned by a NASCAR official stating "that's enough". She was escorted away by her team. Decker signed with Niece Motorsports for the 2020 season. On February 14, 2020, she finished fifth at Daytona, becoming the highest-finishing female driver in Truck Series history. She missed the Pocono race after being hospitalized for bile duct complications related to her gall bladder surgery in December 2019. On September 25, Decker was not medically cleared to race at Las Vegas after experiencing a high heart rate and high blood pressure; because her truck had cleared inspection and was placed on the starting grid, she was credited with a last-place finish in the race. Decker later pinpointed high blood pressure as the cause for fatigue, but with a deeper cause undetermined, she also missed the following race at Talladega Superspeedway, where Kaz Grala took the seat. On February 5, 2021, it was announced that Decker would make her debut in the NASCAR Xfinity Series in 2021, driving the No. 23 for RSS Racing/Reaume Brothers Racing in at least five races beginning at the Daytona Road Course with sponsorship from Red Street Records, who will highlight the musicians they work with on the car, Jason Crabb being one of them. She remained in the No. 23 after Our Motorsports assumed operations. In 2022, she attempted the Daytona season-opener with the No. 33 for Reaume Brothers Racing, but failed to qualify. However, she did qualify for the April Martinsville race, driving the No. 28 RSS Racing Ford in a collaboration with RBR. She also failed to qualify for the spring race at Talladega driving the No. 13 for MBM Motorsports. Decker was also going to run the race at Daytona in August driving the No. 5 for B. J. McLeod Motorsports. However,