Rent Royal Face Off (2006)

Smart, sassy and persistent high school teen Diana Arnold is learning about the role of the Royal Family and realises that the Queen has her face on currency all over the world. While studying great heroes in history, Diana is given an assignment to come up with a cause which would make a positive difference in the world. Her cause becomes the removal of the Queen's face from currency around the world. Diana ends up face to face with the Queen herself and the outcome is a surprise no one expected.