Alexis,
It sounds like you have tried to take things slow and easy with your horse
but for some reason you are not conveying or building any confidence in her.
Are you nervous when you go away from home? Something is causing your horse
great distress to cause her to refuse to go into the arena when just working
slow. Have you done a lot of running or speeding things up without her
being confident in what she is doing?? Have you had her thoroughly checked
by a vet to make sure she isn't sore or hurting when she is asked to exert?
Martha Wright