To get Daisy, you need to get through the Flower Cup in Grand Prix Mode. You don't need to finish every race in first place or even be in the top three racers to unlock her.
F1: Piastri wins Chinese GP, with McLaren teammate Norris second as it happened
Oscar Piastri's victory in Shanghai marked his third career grand prix win, showcasing McLaren's strong performance and their promising trajectory in the constructors' standings.