She became seriously ill and had to be institutionalized for a lengthy period.是什么意思？

She became seriously ill and had to be institutionalized for a lengthy period.

她病得很重，必须在医院住很长一段时间。

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。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

seriously

adv. 认真地，严肃地，严重地；

例句
Any aspirant to the presidency here must be seriously rich...
要想当这儿的主席一定要家财万贯。

ill

adj. 不好的，恶意的，有病的，不吉利的；adv. 坏，不利地，令人不满地；n. 伤害，困难，问题，弊端；

例句
She bore no ill will. If people didn't like her, too bad...
她没有恶意。如果人们不喜欢她，那就太糟糕了。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

be

v. 是，有，存在，做，成为，发生；aux. 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；

例句
The older child should be able to prepare a simple meal...
那个年纪稍大的孩子应当会做一顿简单的饭菜。

institutionalized

v. 使（某事物）制度化( institutionalize的过去式和过去分词)，将（某人）收容在社会福利机构；

例句
She became seriously ill and had to be institutionalized for a lengthy period.
她病得很重，必须在医院住很长一段时间。

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。

lengthy

adj. 长的，漫长的，冗长的，啰唆的（演说，文章等）；

例句
Gates responds with a lengthy discourse on deployment strategy.
盖茨以一篇有关部署策略的鸿篇大论予以回应。

period

n. 时期，（一段）时间，学时，句号；adj. 具有某个时代特征的，（关于）过去某一特定历史时期的，（家具、服饰、建筑等）某一时代的；

例句
...a period of apprenticeship.
学徒期