I wouldn't let her ride in a shanked bit right now anyway. Her little horse, he's so patient and is going to be great for her to learn on, but she pulls on him so much. I'm still working with her on how to use the reins properly, but she hasn't gotten the hang of it yet. I actually work with her for awhile then I usually hook the reins to his halter so that it gives his mouth a break. I didn't even know that they made a mullen mouth happy mouth bit, but I drove to a shop today (hour away) so that I could look and talk things over. I decided on that one, at least to try, because it will be gentler on his mouth as she's pulling more than she should in this learning process. I am thinking about getting a short shanked bit for me to use on him when I ride because I've noticed that he's not quite as responsive as he used to be, I'm sure from all the tugging he's used to from her. He does not neck rein, but I'm working on it. When I got him he would only direct rein, but he is getting better.