At the rightful age of 14, Amidala of Naboo became the Queen of Naboo. The once King had died and an election was held. Amidala was elected. As Queen she insured her people peace. That would be broken when the Trade Federation tries to force the Queen to sign a treaty.
The Queen does not stand for this, and she is helped along the way by many people, two of which are Jedi Knights, Qui-Gon Jinn and Obi-Wan Kenobi. They leave Naboo. Along the way they pick up a boy on Tatooine, a boy with extreme Force powers. His name, Anakin Skywalker. The boy that grows up(or grew up) to be Darth Vader.
The Queen sooner or later returns back to Naboo, but as Padme', a handmaiden. Later she reveals herself as Queen Amidala, and as possing for the Queen is Rabe'. Amidala, with the help of the Gungan, defeats the Trade Federation scandle.
In later years, Amidala marries the 5 years younger Anakin Skywalker, and having two children, twins. The twins were named Luke and Leia.
It is not said as of how Amidala died yet, but that will be decided in the Episode III. We'll just have to wait.