Might be too late, but...
fslflint, and *everyone else*, go read "The Gift of Fear" by Gavin de Becker. He's all wet on guns, I think, but he's got everything else right. This book is about identifying potential threats in advance -- his company is (one of?) the foremost in threat analysis, works with Supreme Court Justices, Sec. Service, etc. etc.
"The Gift of Fear" is focused on women, but it all applies; he talks about how violence *always* is preceded by what he calls "pre-incident indicators" that we all pick up on, typically subconsciously, and lots of other good stuff. Another EXCELLENT book by him is "Protecting the Gift" aimed toward parents.
Go read it right now, and get her to read it, and get her parents to read it.
(Everyone else go read it too)
(And ignore his anti-gun stance, the rest is great)
(OK, I'll stop talking now)
(No, really, everyone go read this book)