当她15岁时，他写了第一本书，书名叫《风》。用英语翻译

she wrote her first book named Wind at the age of fifteen.

at the age of...
在...岁时

When she was 15 years old, he wrote his first book, it was called"The Wind."
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When she was 15 years old, he wrote his first book, it called "The Wind."

When she was 15 years old,he wrote a book named 《Feng》.

When she was 15 years old, he wrote a book named the first book, the wind."

When she was 15-year-old, he has written the first book , the book named "wind".