With the final stage of the World Grand Prix racing through the historic streets of London, England, the Queen is quietly elated she was invited to preside over the finish line by Sir Miles Axlerod. Painted in shades of the most royal blues and never without her jeweled crown, the Queen is the definition of decorum and regality, but that doesn't mean she doesn't enjoy a bit of first-rate competition!
In the movie she appears at the London race. When everyone sees the bomb on Mater they try to get the Queen away, but when Mater claims to know the mastermind of the lemons she wants to stick around, until it was 15 seconds until it explodes. At the end of the film she knights Mater. Mater also introduces her to Lightning McQueen and Finn McMissile.
The Queen is based on the real Queen Elizabeth II, as hinted by the "E" on her wheel trim.