During cheerleading practice in April, Jana Duey’s sixth grade daughter, Karter, sustained a concussion when she fell several feet headfirst onto a gym floor mat. Days after, Karter still had a headache, dizziness, and sensitivity to light and noise. Karter rested for a week and a half at home in Centennial, Colorado, then returned to school when her concussion symptoms were tolerable — initially for just half-days and with accommodations allowing her to do schoolwork on paper instead of a screen and take extra time to get to and from classes. Karter went to the nurse’s office when she had a h…