Wild Honey (Phantom Stallion #22)

The Phantoms lead mare is injured and Samantha wants to help her. But she cant call the vet -- what if he wont let the mare return to the wild? So Sam starts treating the mares injuries in secret. But the horse seems awfully calm for a mustang and she matches the description of a missing mare from California. Is Sam helping a mustang or has she accidentally stolen someones horse?