A sudden pang of remorse hit her when she saw the consequences of her actions.

remorse 由前缀 re-（表示"再次"）和拉丁词根 morsus（"咬"）组成，字面意思是"反复被咬"，引申为"因过错而产生的持续心理痛苦"，即"懊悔、自责"的情绪。