We have an 11 hand pony that the kids do walk trot on and also lessons on the lunge line. She (the pony) is still inexperienced as she just turned five. I ride her also to keep her in line but I can't get her to canter. I think she is just unbalanced and it is not comfortable for her. I am 5'7 and 118 so I think my size is difficult for her to handle. Any suggestions?