This book has been re-issued by the author under the new name of The Warble rather than the Magic Warble.
A social misfit finds her self in another world where she can save a kingdom and make new friends. Kristina Kingsley is a girl who doesn't quite fit in. Her best friend is her pet rat, Raymond. Through magic she finds herself in Bernovem, a kingdom under the sway of an evil Queen. Her adventures there comprise the story.
I recommend the book.
This book may have been received free of charge from a publisher or a publicist. That will NEVER have a bearing on my recommendations.