Is it even worth it?

So growing up, my older sister was verbally, physically and sexually abusive to me. We’re about 7 years apart(I’m 25, she’s 32? I think), we both grew up in a neglectful household and I know she’s been through alot too. But that doesn’t excuse what she’s done. She did apologize to me for everything she put me through when I was 14(the abuse lasted from when I was about 6-9 years old). I’ve forgiven her because I wish to move on for myself, and I’ve expressed to her that until she gets mental help I have no interest in speaking to her. She agreed this made sense, and seemed to understand. That last time we spoke was around 2 years ago, when I again made it clear why I don’t want to be on speaking terms with her. I didn’t even realize she had social media and had access to messaging me. At this point, I’m over the warm regards. I’m over the love being sent. It’s nice, but what would be even nicer is hearing she’s actively getting help. I wanna respond to her message, but it also feels completely pointless. I laugh at the message because I truly don’t know what else to do. Our mother has explained to me that forgiving her is gonna help me- but again I’ve come to forgive her. I just need to heal. The abuse still ripples through me and shows up primarily in my relationship. There’s other things I’ve been through in my life that’s contributed to this as well, and I myself am in therapy. I try to be patient with my mother because I empathize with her position, but it’s not healthy for me to force something with a person I have no desire to be in contact with. I wanna set the boundary, but it feels like I’ve already done that multiple times..