[quote=CallaLily180]
Really? God, I am stupid...
[/quote]

No, I just saw this fairy-tale yesterday...though I did read the manga twist version of it years ago. It does end with the princess getting her prince though, but the plot is pretty much what you wanted. Just make it a different ending.
[url=http://en.wikipedia.org/wiki/The_Goose_Girl]A maid muscles her way into switching places with the princess.[/url] It works 'cause the princess is going off into a different kingdom to be married to their prince, and her parents wouldn't likely visit for years...?