Maddie the Playtime Fairy.

Enhanced descriptions from Syndetics:

Get ready for an exciting fairy adventure with the no. 1 bestselling series for girls aged 5 and up.

Rachel and Kirsty have been invited to meet the seven nieces of King Oberon and Queen Titania - the Princess Fairies! But when Kirsty and Rachel arrive in Fairyland things soon go wrong, Jack Frost and his wicked goblins steal the princesses' tiaras! The tiaras contain special fairy magic that look after happiness and fun in both the human and fairy worlds. They need to get them back so everyone can be happy once again!

'These stories are magic; they turn children into readers!' ReadingZone.com

Read all seven fairy adventures in the Princess Fairies set! Honor the Happy Days Fairy; Demi the Dressing-up Fairy; Anya the Cuddly Creatures Fairy; Elisa the Adventure Fairy; Lizzie the Sweet Treats Fairy; Maddie the Playtime Fairy; Eva the Enchanted Ball Fairy.

If you like Rainbow Magic, check out Daisy Meadows' other series: Magic Animal Friends and Unicorn Magic!