Jill Kintner thought her Olympic dream ended four weeks ago, when she was writhing in the dirt, screaming in agony after re-injuring her chronically right knee in a training crash. She felt no pain Saturday. By finishing sixth at the BMX world championships in Taiyuan, China, the 26-year-old from Seattle earned enough points to barely edge Arielle Martin of Pleasant Grove, Utah, in USA Cycling's yearlong battle for the lone automatic women's BMX berth into this summer's Beijing Olympics.