If its super loose, then she must be using her body in very unusual ways to brace against it. That can't be good for her body.
I've used a tie down on a gameing pony who had a super short/upright neck new used it when racing so he didn't hit me in the face during a moment of adrenalin. It was never on him at any other time.
If she rides exactly the same without it, how is she bracing on it? Does she naturally carry her head so high she would be hitting a loose tie down?
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