S.H.
how about deciding to move on with Life & not focus on the past?
how about approaching today from the standpoint....that positive personal growth can happen?
how about allowing other adults to make their own decisions & not hold grudges against them for their own personal choices which are not affecting you? I mean, seriously, I get blocking so she can't look at your stuff.....but that's honestly the extent as to how far you can go!
& I have found that a lot of FB is all about reconnecting threads from the past. If they begin to tangle anew, then you always have the option of cutting out the knots!
& is she the mother of your DH's children....if "yes", then she'll always be a part of your life.....regardless of the age of the kids (yep, I read that they're adults.)
Find a way to relax, find a way to stop trying to govern other adults, & walk away quietly if she starts her junk again. Peace.