There was plenty of time.She ----- A.mustn't have hurried B.

B
还有很多时间,她不必这么匆忙.
shouldn't have done 表示"不该做的却做了".
如:He shouldn't have told her the truth.(他不应该把真相告诉她.事实上已经告诉了.带有责备的口吻.)
needn't have done 表示"不需要做...",一起远远没有shouldn't have done那么强烈.