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The Princess Test by Gail Carson Levine
This was the first Biddle tale I read and I loved it immediately. It is a retelling of The Princess and the Pea with Lorelei as the pickiest person ever. Her companion grows tired of her and decides to lose her. After wondering through the forest, Lorelei arrives wet and shivering at a palace where Prince Nicholas lives. By luck, they had already met and begun to fall in love. By further luck, his parents are conducting a series of princess tests whereby they will determine who is a real princess and should marry Nicholas. And with more luck, she pretends to be a princess. The tests are crazy stuff but they culminated in a stack of mattresses on top of a tiny pea. Of course Lorelei feels it (although she's not sure what it is) and wins the prince's hand!
Just a really funny take on the story with a bit more background for the princess.