Princess Ellie Takes Charge — Diana Kimpton

Princess Ellie is crazy about her ponies! Any time she can, she trades in her royal crown and fancy dresses for her riding helmet and boots, and heads out to the Royal Stable. Along with her best friend, Kate, Ellie takes her ponies for rides and jumps all around the palace grounds. Together, they go on adventures, solve mysteries, and, of course, spend lots of time with Ellie's adorable ponies.

BOOK #7: PRINCESS ELLIE TAKES CHARGE
Princess Ellie has learned a lot about taking care of ponies from Meg, the palace groom. But when Meg get injured and has to go to the hospital, Ellie finds out that looking after six ponies is a lot harder than she thought. Can Ellie save the day when her ponies need her the most?