Vanellope owned the Royal Racer when she was Princess of Sugar Rush. Vanellope's first kart was only shown in the possession of Turbo in his disguise of King Candy. It was a pink and white snowball style kart that doubled as the royal throne when at the palace. It was presumably destroyed when it was eaten by a Cy-Bug along with Turbo. An image of Vanellope in the kart that was on the side of the Sugar Rush console tipped Ralph off that King Candy had been lying to him.
As part of Vanellope's desire to become a real racer, she built a simple kart of her own. It was made out of scrap materials found by her at the local junkyard and ran on pedal power. It was consist of matcha swiss roll as the front body, a wafer as its main body, a marshmallow as a seat rest, various cookies and chocolate dipped pretzel as the wheels, and a white flag. She named it "The Likkity Split" and said it was the "fastest pedal power, west of the Whac-a-Mole". The other racers destroyed this kart as part of an attempt to keep her from racing.
As part of Vanellope's deal with Ralph to get his medal back, the pair went to the Kart Bakery and created her current kart. Due to Ralph accidentally breaking the frosting tubes that they were using to decorate the kart, it is an odd-looking vehicle, composed of frosting, sprinkles, and other sweets with no overriding theme, unlike the other karts in the game. Despite this, Vanellope loves it as she finally has a real kart, going so far as to have Ralph and herself sign it.
When the Cy-Bugs attacked Sugar Rush, Vanellope's kart crashed and had to be left abandoned near the finish line. During the frantic evacuation to Game Central Station, Crumbelina DiCaramello is glimpsed driving her kart up to the exit walkway's farewell banner, then abandoning the kart to run the rest of the way. When Vanellope dashed back to help Ralph, she commandeered that kart, drove it into Diet Cola Mountain, and used her glitching ability to save Ralph in the nick of time. The kart is then glimpsed off in the distance, falling from the sky to crash to the ground, while Ralph and Vanellope landed safely at another spot. Crumbelina's kart probably was restored when the game was then reset, and so was returned to her, or a replacement was made in the Kart Bakery.
Vanellope is never seen driving the Royal Racer in the film (besides the Sugar Rush console art) but she does briefly interact with it after she evades the taffy-covered Ralph at the starting line.