Nothing you've described in your post is illegal. She can turn into a stark raving Trump lunatic and that might put off her right thinking liberal friends. But that's life. He probably is controlling and manipulative and a complete dork. But that doesn't mean she's in danger. When you've got something concrete then by all means light your hair on fire to help her. In the mean time I think you've missed the point. You're suggesting vets with PTSD are dangerous. That might be a better place to start...
http://www.ptsd.va.gov/public/where-to-get-help.asp
Among other sources.