A Star is Born- Stardust Stables

Enhanced descriptions from Syndetics:

Welcome to Stardust Stables - only daredevil riders need apply! Stardust is a stables with a difference... Set in the Colorado mountains, it's home to the super-talented kids who are stunt riders for movie stars!
New girl, Kami, can't wait to join the team at Stardust, but she soon discovers that life there isn't all glitz and glamour - there's plenty of mucking out to do ... not to mention the hours of training! When a studio comes looking for a stunt girl for a major new movie, Kami is eager to get the job, but will she have enough experience to rise to the challenge?

An exciting new series not just for horse-mad girls, Stardust Stables takes readers on the ride of their lives! From best-selling author Sable Hamilton (Dark Angeland Twisted Heartas Eden Maguire and Black Pearl Poniesas Jenny Oldfield) Stardust Stables combines glitz and glamour, horses galore, gorgeous boys and cool Hollywood action! This is a series with a twist! Perfect for girls aged around 10 to 12 years old.