I'd recommend supporting her as she finds her way back to emotional/mental stability. Later on, she may wish to press charges against the man (hopefully before the statute of limitations comes into effect). It is understandable that you want to protect her, and you can, by helping her come to terms with what has happened to her - by being someone she can rely on (in a healthy context). Ultimately, it'll be up to her if she wants this man to be punished, and she'll need to be a lot stronger when/if she decides to do that.
Anger/aggression is the last thing she needs - especially when sensing it from someone close to her. She is way too fragile for that right now.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen