She also seemed 'very confident' about getting attorneys involved and that they CAN, in fact, force a structured separation in a marital home. I don't know if that was a bluff, or if her consulted attorney actually told her that.
Sounds like talking to your lawyer is definitely a good thing to be on the safe side, but as you note, it very well could be a bluff. Given that she's seemingly tried every other tactic she can think of as well, it seems more likely. And if she really had solid legal standing, wouldn't she have led with that a lot sooner?
Me, WW - Upper 30s BD - Apr 1 2016 EA - Apr 7 2016 (discovered; ongoing for months; did not confront right away) Confronted wife about EA - May 17 Wife sent NC email to OM - July 11