Keeper by Kathi Appelt

I love this book.
     Keeper is a book about a girl named Keeper. Her mermaid mama, Meggie Marie, left her when she was three, and now, at ten years old, she needs Meggie Marie. Dogie was going to sing his two-word song to Signe on the blue moon night, and the night blooming cyrus was supposed to bloom, and the blue moon gumbo was supposed to-'supposed to' is just too much for Keeper. Everything went wrong! Can Meggie marie fix it? Can keeper even find Meggie Marie? Will her perfect plan be a disaster?
     People who are about to read Keeper should look out for symbolism. I couldn't figure it out, maybe youi can. In the book, Kathi was trying to emphasise the blue moon. What could it represent? There is also a nice description about haints... try to figure that out as well.