The woman was sitting on her horse when the animal suddenly reared up.
The horse then landed on the woman.
She sustained suspected head, abdominal and pelvic injuries in the incident.
The RACQ CareFlight Rescue helicopter was tasked from the Sunshine Coast base at Maroochydore around 12.30pm.
CareFlight’s Critical Care Doctor and Intensive Care Flight Paramedic treated the injured woman on scene before she was transferred to Nambour General Hospital for further medical care.
She travelled in a stable condition during the flight.