at that time she was only a five years old girl.或者是she was only a girl five years old.

at that time she was only a five years old girl.或者是she was only a girl five years old.
at that time she was only a five years old girl.
或者是she was only a girl five years old.

at that time she was only a five years old girl.或者是she was only a girl five years old.
不正确
改为：At that time she was only a five-year- old girl.
用：a five- year- old 去修饰girl.
翻译; 那时她只是个5岁大的女孩子.
或改为：At that time she was only five years old.
那时她只有5岁大.

都不对，正确的是
At that time, she was only five years old .
/
At that time , she was only a five-year-old girl .
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不对了，应该是介个样子的
At that time , she was only a five-year-old girl
或者是She was only five years old
或者是She was a girl who is only five years old
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