Good news that she's agreed to move out. The sooner the better.
Sure she'll spew - don your spew jacket.
Be the rock. Way to go U-turn!
BTW it's not you that's making her look bad - it's her own behaviour that is.
You never know - once she moves out and you separate your finances she may be faced with the stark reality of the consequences of her choices. She may want to come back home, but at that point you can dictate the conditions 100% - Dear John letter to OM, full transparency, MC, etc. if you even want her back at that point.
But I truly believe this is want she needs at this time. A good dose of reality.
M: 59 W: 53 M: 9 yrs T: 14 yrs No kids together but D30(hers), S27, S24, D21(all 3 mine) W moved out 11/18/2013 D-Day 12/14/2013 W moved back home 12/1/2014