Amber the orange fairy by Daisy Meadows

The seven Rainbow Fairies are missing! Rachel and Kirsty search for one in each RAINBOW MAGIC book. Read all seven books to help rescue the fairies and bring the sparkle back to Fairyland!

Fairyland is home to seven colorful sisters. Together, they are the Rainbow Fairies! They keep Fairyland dazzling and bright. But when evil Jack Frost sends them far away, the sisters are in big trouble. If they don't return soon, Fairyland is doomed to be gray forever!

Rachel and Kirsty have already found one Rainbow Fairy, but now Amber the Orange Fairy is trapped in a seashell! Can they rescue her, too?
 
- Goodreads Summary