From bouncing confidence she had retreated into self-pity.是什么意思？

From bouncing confidence she had retreated into self-pity.

她从信心百倍变得自怜自哀。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

bouncing

adj. 精力充沛的，精神饱满的，活泼的；vt. “bounce”的现在分词；

例句
My father would burst into the kitchen bouncing a football.
我的父亲会颠着足球冲进厨房。

confidence

n. 信心，信任，秘密；adj. 骗得信任的，欺诈的；

例句
I have confidence in the ability of the players...
我对于球员们的能力充满信心。

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。

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。

retreated

v. 撤退( retreat的过去式和过去分词 )，隐退，离开，规避；

例句
Croatian army troops retreated from northern Bosnia and the area fell to the Serbs...
克罗地亚军队从波斯尼亚北部撤军后，该地区落入塞尔维亚人手里。

into

prep. （表示方向）进入…中，（表示所属）输入，（表示状态）进入…状态，（表示时间）持续到；

例句
By 1838, the abolitionists had shamed parliament into ending slavery in British colonies...
到1838年，废奴主义者迫使议会出于道德压力而废除了英国殖民地的奴隶制。