SC, I understand your message and yes, if the police were to be involved, the sooner the better, but I am still concerned that most of the interactions were, no pun intended, oral. But, again, since I do get your message and the sense of urgency that you are communicating with it, maybe OP can provoke the subject to do something in writing. This is a precarious path, though, and I would not recommend that OP take it on her own. Engaging the resources you are recommending would be the best course of action. Actually, come to think of it, I would engage those resources before talking to ANYBODY else, be it the husband, the police, the friends whose contact info the subject has, etc.

The thing is, RAINN deals with similar cases day in and day out, so they must have amassed a wealth of info on how to proceed AND what to avoid.