她13年保持不败。用英语怎么说？

她13年保持不败。

She was undefeated for 13 years.

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

undefeated

adj. （选手或运动队）未被打败过的，未输过的，不败；

例句
I'd like to fight him because he's undefeated and I want to be the first man to beat him...
我想和他对阵，因为他从没有输过，而我想成为打败他的第一人。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；

例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。