Don't play games AML! How old are you? Are you being fake BECAUSE that will show in your vibe? This is not about showing her two can be out. This is your marriage!
You said you needed to get out for a few (minutes I expect not pints?)good for you. Now spend this hour and half in a bar somewhere sorting that vibe out. You can't ACT this, you have to BE this. It's about where you're COMING from as much as what you DO
She'll smell desperation, fakiness, game playing. She's going to be really crappy, I reckon. But you did this. You can only control you and you chose to do this.
