I knew she was going to seduce you. Maybe I should have opened my mouth. I dunno.
How to salvage it? Well, you can't go backwards. For a few days she is acting like the perfect wife.... surely you realize she didn't change into the perfect wife overnight....
The best you can do is keep your eyes wide open and your guard up. It seems as if W wants to make this all go away with seduction and sex. She is using it as a tool to get what she wants right now, I am sorry.
I would make those boundaires very firm and not flimsy. Really think about what you need. Not how she might react to what you need or what her "excuse" might be for not giving it. Really set forth those boundaries that you need going forward.