It begins to make sense to her to pick up where the law left off. She goes to a firing range. There's nothing subtle going on here. The moral is meant to be that violence begets violence. The performances are difficult to assess.
Field is fixed in the moviegoers' consciousness as a cutie, which is a problem.
As well, Field must act in the company of Ed Harris, one of the great underrated American actors, who plays her husband. Where Eye For An Eye works well is in its dismissal of general notions of control and safety. It's nice to believe that in some way, we can protect the people we love - enough money, enough burglar alarms, enough education, enough good luck charms or talismans or whatever. If you didn't pick that up on your own just reading the local papers over the last two years, maybe Eye For An Eye is a movie you shouldn't miss.