To access Queen Amidala, beat the game on "Jedi Mode" with Obi-Wan Kenobi. After doing this, go to the character selection screen on the game you beat on "Jedi Mode" with Obi-Wan Kenobi. Now highlight Obi-Wan, but DO NOT SELECT HIM (In other words, move your green character selector onto Obi-Wan's picture, then stop!) Now hold down Select. The picture at the top of the screen should change from Obi-Wan to Queen Amidala. Now press "X" to select the Queen.