The cops don't seem to be able to prevent crime from happening. They might be able to stop a crime in progress or to investigate and write reports of what happened. But even then it's not enough sometimes. And lots of people become victims before the police are able to stop some people.
Does she live in a state where you can shoot to kill someone who enters your home? Have her ask the cops if she should shoot him in the chest or head next time he comes into her place. Maybe not, that could be contrived as premeditated murder. Have her ask the cops where to get a handgun license.
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