Wow Michelle, that was a pretty bold move. I am not sure it will get the reaction you are looking for though. There is no reasoning with either of them right now.
You are giving OW power over you right now. She is not worth it. I bet that she suspects that something was going on with you and your H...thus the pressure on him. Let her screw it up all by herself.
As hard as it is, I think the A has to die a natural death without any pressure from you. If you do something to "damage" their R then he may resent you for it. Instead of seeing you in a good light he will think "I could have been happy if only you had stayed out of it." He has to figure it out on his own.
I am glad you have had some downtime this weekend. You needed it. Have a good memorial day!