[4] Her hopes of qualifying for the United States equestrian team for the 2004 Summer Olympics were dashed when she was eliminated in a jumping event.

[10][11][12][13] On August 29, 2024, Halliday suffered a traumatic brain injury after falling during a cross country round at the USEA American Eventing Championships.

[16] Halliday first started racing at age 16 in a 1967 Datsun 510 that she shared with her father, Don, who was a Sports Car Club of America instructor and vintage racer.

[20] In parallel, Halliday competed at the LMP2 class of the American Le Mans Series for Intersport Racing, finishing sixth in 2005 and vice-champion in 2006.

Halliday had a two-year hiatus from racing to be a commentator for Eurosport covering the 24 Hours of Le Mans, as well as an expert judge at Speed's GT Academy series.

[22] It's a big honour for me to have been selected for the GT Academy USA expert panel alongside two legends of American motorsport, especially as we have now helped to ignite one man's future racing career.

To step from virtual simulation to Le Mans 24 Hours in just over three years is an unbelievable achievement and one that our winner will be hoping to emulate one day.