They warned her Wave Force was phenomenally hard to control. She didn't pay enough heed, figuring - not top of the class, no, but she's one of the best manipulation types, surely she could handle it? It took some badgering to be taught the technique at all, and a long time studying the equations before she made the attempt.
Out in the expanse of the Outback, far away from anything important that might be inconvenienced by having its atoms turn to quantum soup, two dozen promising students were allowed to try actually using the most basic wave force technique, her among them. It didn't go well. She formed the boundary, drew her impeller field through it, and then- Pain. Nothing but pain and noise and darkness.
Now she's lying crumpled on the ground somewhere, semi-conscious, the approximate shape of a human teenager wearing angular panels of white armor with red highlights, motorcycle-style full head helmet included and two large guns attached to the armor's forearms. She probably made quite a light show when she went down, and now she's wreathed twenty feet around in humming blue energy that feels like sticky clingy zappy fabric, difficult to move through, the impeller field on automatic defense.