A more aft mount will allow the tip of the ski to be driven more aggressively and be more stable at speed, but will cause the turn initiation to be slower and the ski more reluctant to pivot when skied with a centered stance. As others have said -2.5cm is certainly within a reasonable range for that ski and I'd agree that she should try them as is. If she feels like they are difficult to ski, remount closer to recommended.
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