Well she is serious now about divorce. Says me cancelling plans with her after finding out what she was doing Saturday was me punishing her.
Not sure she was ever really back in the M, doesn't really sound like it. She quit wearing her ring 2 weeks ago, and she got back on Snapchat, and because you got angry about the Snapchat thing she says it's over now. Here's the thing O, she KNEW this would be your reaction. She KNEW it was a boundary she shouldn't cross. But she chose to anyway, and why? I suspect it was because she knew you would react this way and that would open the door for her to punch the D card again and blame you for it. I'm not buying it, I think this is all part of her plan to escape.
At least you know what to do. Pull back, give her time and space, detach.
Very sorry you're going through this again so soon. Do give yourself a high five for not setting up a joint account with her though, because she would be busy draining it right now.