Kianna, Pony Girls series, by Lisa Mullarkey, published by Calico (an imprint of Magic Wagon, a division of ABDO), 2015.

About the book:

Carly, Daniela, Gabriela, and Kianna – the Pony Girls are ready for their first summer at Storm Cliff Stables! In these four books, each girl has the chance to narrate her own story. Their unique personalities come through as they navigate being away from home, making friends, and caring for the horses at camp. Readers new to chapter books will love this entry into the world of Storm Cliff Stables, with larger text, fewer words, and younger girls in the same wonderful setting!

Kianna can’t wait for her birthday! Care packages, lunch with Aunt Jane, and finally being as old as the other Pony Girls. But is everyone too busy with the talent show to remember her big day?