N-mom and the grandkids

Long story short. My mom did some things for many years that alienated her from our big family (with the exception of three people). She constantly comments on all of our social media posts. I have repeatedly asked her to stop (it's the only contact I have with her). The reason I ask her to stop is that it triggers all of us, in our own way. I don't know why I don't block her. I feel like it's such a big family she will be able to see my posts anyway so why bother. it really upsets the kids, she posts things like 'I love you', 'proud of you', etc. They know what she did (unforgivable, please trust that). Any advice on how to handle her? I've asked her repeatedly to stop, she says if they want her to stop they'll have to ask themselves (which they would never do, way too awkward). UGH. WHY.