Hannah Thomas, 15, a freshman at Downingtown West who looks bigger and stronger than the other girls on her team, got hit with a ball on the side of her face in November 2009. She kept playing but can't remember the rest of the game. At dinner afterward, she didn't feel well and by the end of the week, "everything got 10 times worse. I couldn't focus on school, my eyes were shaking," she said. The doctor said she had suffered a concussion and told her to stay home from school for a week.