You are on the right track, but a bit to the extreme in nature.
Yes, you need to just move on with life, with or with out Ms Gno (the ultimate way to be "as if"). You did so by going out on your own and giving her a "does of her own medicine", and as you note, she didn't like it. And THAT is exactly what I'd keep doing.
In the mean time, she'll want to argue. And I'll bet about the same repeated thing over and over, right? Then prep yourself with the stance: "what is the point?".
The moment you start going about your way and not coninuing to hash out the rhetoric over and over, after a few cycles of it, it will become you, and surprisingly, things become far less personal, and believe me, your W will notice that.
Me 35/XW 33 S13 & S12 M: 10/17/98 OM & S: 07/08 D final 06/09/09 12/03/09 - 06/13/10 "Piercing" 06/13/10: Engaged to Re-marry 10/17/10 06/25/10: Expecting baby #3 2/14/11
