If you want to make a difference and still feel accomplished in your career, get the PhD and do work specifically for victims of abuse. If you go to law school, the closest work that you can do to what you do now is criminal law, but there's no way to guarantee that you're going to have a job at the DA's office where you'll be getting case after case with victims of abuse. In fact, I can guarantee that you won't. You'll get everything, and only the occasional case dealing with victims of abuse, because no one gets to specialize on what kinds of cases they take. What's worse is that once you get to law school, chances are you won't want to practice criminal law. Something else will draw your attention, as it does in the vast majority of cases, and you'll put all thoughts of your current goals behind you.
So, if you want to build upon a career where you can choose who you help based on your strengths and experience, expand on what you're doing now. Law school will only hurt that.
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