Milly the river fairy : Rainbow Magic: The Earth Fairies Series, Book 6

The fairies are going green! The fairy king and queen have just put together a new team of seven fairies for a very special mission. They are the Earth Fairies! Together, they're going to work their magic to clean up the environment. But they can't do it alone. Luckily, Rachel and Kirsty are ready to help! Rachel and Kirsty are helping Milly the River Fairy clean up a polluted river. But troublemaking goblins keep getting in the way. The girls need to get Milly's wand back to make the river a safe place again. Find the missing magic wand in each book and help save the environment! "Rachel and Kirsty are helping Milly the River Fairy clean up a polluted river. But troublemaking goblins keep getting in the way. The girls need to get Milly's wand back to make the river a safe place again"-- from amazon.com