Matilda by Roald Dahl

Matilda is a book about a little girl about 4 years old that has mean parents but has a very young and nice teacher who she likes a lot. Over her school years she has to deal with a frightening principal who throws the hammer and throws people into the Chokey (read about that in the book!). Suddenly she finds she has a magic power to levitate items and uses this to her advantage as to knock out her principal. Her family then have to move to Spain because her dad is in a bunch of crooks but then her parents allow her to stay at her teacher's house forever.