Do me and my horse have a good bond? If not, how can I make it better?

I've been riding my horse, Savvy, for a little over three years, and I want to know if we have a good bond. Once I left her in the coral as I left to get something, and she followed me to the gate and waited for me as I returned. She had her ears forward, and she listens to me pretty well when I ride her. See when she was trained the person who trained her knocked her unconscious by pulling the reins back to hard, and she fell backwards and banged her head on the wall. For the first year I rode her, I was basically retraining her to be not spooky and confident. We have made a lot of progress, she can lead on trails, but she doesn't listen to me too well when we ride alone (although the stable I ride at we have always had many people in one class, so maybe she's just not use to it?) When I ask for her canter, sometimes she puts her ears back and will do a mini-buck or a kick. And sometimes when I ask her to even trot she will put her ears back. It really upsets me that she does this, I want her to enjoy the ride as much as I do. Whenever I walk by her stall she will put her head up and her ears forward, but sometimes I think she is just doing that cause she wonders if I have a treat (after riding I always give her a treat). I have had a hard time getting her canter even, the only time it seems like she will lope for me without a problem is when we play games like Texas Barrels, so I don't know if she wants to lope for fun, or if it's cause I'm asking her to. Please help, I really would appreciate tips and I love her so much, when I buy her I want her to love me with all her heart, like I do to her.