I'm in the middle of training a four year old pony, in english. She responds very well to pressure and release, but when it comes to lunging her she bolts. I have a round pen that I work with her in and she is very one sided. I've been doing some work on her off side (right) but she is very flighty. Other than this she is very sweet and gentle and isn't spooked easily. Is there any exercises or drills that I can do with her to help with the one sidedness so I can get lunging her, and riding?