Kantor, Melissa. If I Have a Wicked Stepmother, Where is my Prince? 2005.
I could tell you what was going to happen in this book right from the beginning. This is stereotypical YA lit. In a nutshell: Girl's mother dies. Girl's father remarries a woman with two children. Father moves them across the country. Stepmother treats her unfairly. In the end, they come to an understanding and live happily ever after. And, on top of that, there is the "new girl" stereotype on top of it. She falls for the most popular guy in school, he falls for her and now she is instantly popular too, even though no one would talk to her just last week.
There is nothing new here, but it's still entertaining if if you are into this sort of thing and haven't read it 20 times already. The good thing about this one is that Lucy is pretty cool and readers might enjoy her sarcastic wit.