Her whole attitude had undergone a subtle change.是什么意思？

Her whole attitude had undergone a subtle change.

她的整个态度发生了微妙的变化。

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

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

whole

adj. 全部的，所有的，完整的；n. 整体，整个，全部；

例句
The whole system should be abolished.
整个制度应该被废除。

attitude

n. 态度，看法，姿势，个人风

例句
I know you're above me socially, but I must say I find your attitude offensive...
我明白你的社会地位比我高，但我得说我觉得你的态度很粗鲁。

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。

undergone

v. 经历，承受( undergo的过去分词 )；

例句
Can you possibly imagine all the horrors we have undergone since I last wrote you?
你能想象得出自从我上次给你写信以来我们所经历的所有可怕事情吗？

subtle

adj. 微妙的，敏感的，狡猾的，巧妙的；

例句
...the smiles and artifices of a subtle artful woman...
阴险狡诈的女子的笑里藏刀

change

vt. 改变，变更，交换，替换，兑换，换衣服（床单）；vi. 改变，转变，交换，互换，换衣，更衣；n. 变化，改变，交换，交替，零钱，找头，代替物；

例句
There'll still be a feeling abroad that this change has to be recognised.
人们还会普遍觉得这项变革早晚得接受。