Breidinger was born in San Francisco and raised in Hillsborough alongside her twin sister Annie. Her father is German, her mother Lebanese. She was educated at Mercy High School in Burlingame, graduating in 2017. Her introduction to motorsport came when her father took her and her sister to a go-kart school after seeing a newspaper advertisement for it, and subsequently bought both girls karts of their own. A crash during a 2011 race at the CalSpeed Karting Center with Logan Sargeant — later a Formula 1 driver — left her with a broken arm, the only significant injury of her career.
At fifteen, Breidinger moved up to the USAC Western US Asphalt Midget Series, finishing runner-up in the standings in each of her first two seasons before winning the series championship in 2016. The title made her the winningest female driver in any USAC asphalt division at the time. She later credited watching late model races at Madera Speedway, while still competing in midgets, with inspiring her switch to stock car racing. After graduating high school in 2017, she relocated to Charlotte, North Carolina, to further develop her career, spending the next several years racing late models in the Southeast while making occasional ARCA starts.
Breidinger made her ARCA Racing Series debut in 2018 with Venturini Motorsports. After additional starts in 2019 through a GMS Racing development program, she joined Young's Motorsports in 2021 for a part-time ARCA schedule, becoming in her debut the first Arab-American woman to compete in any national touring NASCAR series. She moved back to Venturini midway through 2021, joining the Toyota Racing Development program.
Her first full ARCA season came in 2022 with Venturini, where she finished sixth in the championship with six top-tens. In 2023, she scaled back to a part-time ARCA schedule while also racing full-time in the inaugural Toyota North America GR Cup — a touring series for Toyota GR86 cars — to gain road course experience. She secured her first ARCA top-five in 2023, ultimately earning four top-five finishes with a best result of third at Kansas.
Her final ARCA season came in 2024, again with Venturini. Despite an early exit at Daytona due to a multi-car crash, she amassed eleven top-tens in twenty races and finished fourth in the championship standings with an average finish of 12.2.
Breidinger made her NASCAR Craftsman Truck Series debut in 2023 for Tricon Garage, finishing fifteenth at the Heart of America 200 and adding two more starts. She moved up full-time to the Truck Series with Tricon Garage for 2025. The rookie season proved difficult; through fifteen races she posted a best finish of eighteenth at Rockingham and ranked twenty-second among full-time drivers. The final stretch of the season brought further struggles, including a fiery incident at Watkins Glen after an engine failure and a break-in at the race venue in which personal belongings were stolen. She ended the year twenty-third in the driver standings.
For 2026, Breidinger parted ways with Tricon Garage and transitioned to a part-time schedule, signing for eight races with Rackley W.A.R. in the team's No. 27 Chevrolet Silverado RST, supplemented by additional starts with McAnally-Hilgemann Racing.
Outside motorsport, Breidinger pursues a modeling career she has described as providing financial leverage for her racing. She is signed with IMG Models and has appeared in Marie Claire Arabia, Glamour, Flaunt, Shape, and GQ. In 2025, she became the first NASCAR driver to appear in Sports Illustrated's Swimsuit Issue. She has spoken openly about past struggles with body confidence and endorses the Women's Sports Foundation, appearing at several of the organization's fundraising events. She is partnered with Raising Cane's, Celsius, Sunoco, Coach, Dave and Buster's, and the tequila brand 818 Tequila. In 2021, she appeared on The Ellen DeGeneres Show.
Breidinger's significance in American motorsport rests partly on her historic status as the first Arab-American woman in NASCAR, a milestone that has given her a platform both within and beyond racing. Her four years in ARCA with Venturini Motorsports built a solid technical foundation, and her consistent finishing record across those seasons demonstrated genuine racecraft. The Truck Series has posed a steeper challenge, though her longevity in the series and her profile outside it suggest a career with room to develop.