Thanks for all the replies...
I really appreciate all the responses.
Just to answer some of your questions and comments...
The horse's owner is a very novice rider so she is too afraid to ride the horse, even though she is really trustworthy, she is very forward. The last time she was at the barn to see the horse was last March which is the last time the bit and martingale were changed.
The bit is a Dr. Bristol.
Anytime I ride her I have to hold her either my back and shoulder because she always wants to move faster. She prances around when I try to walk her, she rushes her trot if I don't hold her, and if I don't hold her in her canter she rushes into it and actually slipped and fell in a corner once because she was rushing so much. She is a real sweetie she just needs an owner to ride her everyday. She is only ridden 2-3 times a week now.
As for my release, I know I have that problem with her. I never know when she is going to take off, sometimes she goes right to the fence and if I stick with her I can get a good release, but when she takes of early I lose it. Just something we need to work on together.
Shaking her head after the fence...I think she was getting more excited because there was another horse walking past. She also gets like that anytime I ask her to bend anywhere that isn't a corner. I don't know if that is partly her tack, or something else because she flexes herself nicely in corners.
I don't want to start circling yet right before fences because she does tend to look at everything and has an amazingly sneaky and fast refusal for such a green jumper. If she doesn't want to jump and I won't let her refuse she also runs through jumps.
This has turned into an essay so I will stop here. Any more comments please feel free...