the pony-mad princess princess ellie to the rescue (the pony-mad princess)

Princess Ellie is pony-mad! She'd much rather be riding or helping out at the royal stables than having boring waving lessons. But someone is spying on her...and when Sundance, one of her beloved ponies, goes missing, Ellie is sure that the mysterious girl in the woods is to blame. Can she solve the mystery and rescue Sundance before it's too late?