The helmet is sitting too far back on McKenzie's head. In this position her forehead will not be protected in a fall.
Put the helmet on with the tip facing the back, the brim will be just above the eyebrows to protect the forehead, the two adjuster straps should (snugly) frame the ear and plastic grommet should be locked just below the earlobe. Buckle the chinstrap and tighten so there is only enough slack for one finger to be place between the straps and chin. Ride safe!