She's going to be angry for a while until you start the exposure... If you can get everyone or as many friends and family as you can to REFUSE to accept OM ... EVER... her fantasy world of leaving you and hooking up with this guy will start to shrink...

Once you expose and THAT additional shock hits her, reality will start to slowly creep in...

Before you exposed she was completely immersed in her fantasy world and it was a perfect bubble of indifference to what happened around it... You just shoved a pin in there and she didn't like it.