英语翻译我在做英语阅读理解时,其中有1个问题是what was turn about mary when she was

英语翻译
我在做英语阅读理解时,其中有1个问题是what was turn about mary when she was 14?我不是很明白这个句子的意思,其中这个题目的答案是：The most important reason for her going to the studio was that she wouldn't like to stay at school.
原文中提及：Mary她一开始是以为自己不愿意留在学校，所以才去studio；后来然而她发现她自己真的喜欢表演。