Thank you for putting your minds to work :) I definitely appreciate it.
Draftrider, I really wouldn't call it fearful. She doesn't pin her ears or get bug eyed, or anything like that. She doesn't bolt, and she'll turn wherever I tell her to, she just does it really really quickly, and I can't get her to maintain a calm speed. I know that the horse is supposed to maintain whatever gait you put them in, be it walk trot or canter until you ask for something else, but she doesn't. If I put her on a loose rein on the trail, she'd walk all day with just a lean here or there from me to tell her which trail to take, but if I let off contact with the reins in the arena, we'd be full out galloping on the rail in about 6 strides. I've tried that, to let her run until she's tired and then make her run some more so that the stopping is because I said so. It worked for about 10 minutes, until she got her breath back, and then she was ready to start all over and I honestly didn't have the energy to go through it again. Sometimes at the canter if I circle her, I'll get really nice collection and she'll slow back, but when she goes back to the rail she increases pace again.
And let me tell you, the time I tried to keep her running until it was my idea, her legs were shaking cause she was so tired, but as soon as she caught her breath she was ready to go all over again. My mom has ridden her and she acts the same way with her, as well as a couple of the other more experienced riders at the barn. She's not out of control, exactly, she's just quick. She does whoa when you ask for it, but she despises standing still. She'll paw at the ground and fidget after more than 3 seconds, but she'll stand still for hours while you're grooming her, but when you're in the saddle, she keeps her feet moving even when you want her to be still.
Like I said, she really doesn't act fearful. There's no shying, no eye-rolling, no bolting. She doesn't buck or rear ever, and her ears are almost always one forward, eager and the other tuned in to me. I've worked her for 5 hours at a time, trying to get her to relax and the real problem is she has more stamina than I do. I was plain exhausted and once more, as soon as she caught her breath back, which only takes a minute or two, she was ready to start all over.