Some other verses your heroine may like to quote at appropriate points, not so much about smiting the evil doers, but about their own role:
Philippians 4:13 I can do all things through Christ who strengthens me.
and possibly (from the "introduction" to the Book of Judges in which appear Samson, Ehud (God's left handed assassin) and lots of other interesting types)
Judges 2:18 And when the LORD raised them up judges, then the LORD was with the judge, and delivered them out of the hand of their enemies all the days of the judge: for it repented the LORD because of their groanings by reason of them that oppressed them and vexed them.