Reframe, block her on IG too. My WW is an IG fiend, i had to cut ties there as well as all other social media. My wife hasnt posted much as she is still hiding from the public blowback of her affair being aired to the world, but OM posts often enough of the two of them together.
Ive followed your story and its very similar to mine.

Check it out if you want. - http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2784300#Post2784300

the less exposure you have to her flagrant BS that she posts the better off you'll be. Knowing you blocked her on all fronts and only respond to her when you need to will get her to take pause, and if it doesnt eventually. Eff it, you deserve better.

Strength to you brother.

M: 35, EX-W: 3, S:4
All Divorce Proceedings Complete - Oct 18
-----------------------------------------------------
2nd EX - Was Engaged - Diagnosed BPD
2 Major breakups.
2 Rebounds