Nell van Vliet arrived in the U.S. to swim, but the question was raised whether she was eligible to compete. “Obviously because [Nell] was a sure winner,” an AAU official conceded.

When chubby Nell van Vliet, 22, a baker’s daughter, arrived from Holland two months ago, she waved her hand at the questions, ticked off U.S. women swimmers: “Free style? Yes, Ann Curtis, the best in the world. Your backstroke swimmers? Two or three good ones. But breast-strokers?” Nell wrinkled her…