Likely just needs more miles. If he was a trail horse he may not have learned to balance himself except for going forward in a fairly straight line, if no one schooled him in circles. Your daughter will benefit if she takes him out of the barn and asks him to move his hindquarters. She needs to look at his lower hind leg and ask by moving the tip of the lunge whip in the air near his hip. We ask gently first then gradually increase until he moves. She is to immediately turn the whip downward even if he so much as rocks his body sideways without taking a step. She then starts again, asking gently. He may not have a clue so she needs to be patient and help him. It is the release of pressure (her stopping with the tap and pointing the whip downward) that teaches. Have her work on this until she is proficient at moving both sides by just tilting her head and he moves his hiney. When she's leading him always make him turn away from her, not turn to the left, then he's turning her. The dominance thing. This is the preliminary to getting him to step his front over.