In March 2024, Cullen made her return to motorsport as she teamed up with fellow compatriot Armstrong in IndyCar, as he embarks on his first full season in the category with Chip Ganassi Racing.
Since their partnership began, Armstrong has seen an up-turn in form, with two fifth place finishes and most recently, the 23-year-old achieved his first podium in IndyCar, finishing third in Detroit.
Despite the heartbreaking result, Cullen kept his positive mindset and insisted that the team ‘will be back’ and would learn from the weekend.
Speaking with the Associated Press ahead of the Indy500, Armstrong spoke of the impact she has had on him already.
“She has all the experience in the world,” he said.
“She’s seen championships won, she’s seen how it’s done by Mercedes and all of that, so having her on board is a source of inspiration and guidance and motivation.”