Is she totally 'dead' to you? Is it really, really finished for you? Are you absolutely sure that that door is closed forever - even if she's dying?
I am in this situation with my dm. It's been a long time. (more than a decade) I've done a fuckton of therapy. & Now I'm contemplating her death. I hear on the distant jungle drums that she's had major surgery & didn't expect to live but she did pull through eventually. I'm questioning whether I break the ice to make peace before she does really die, or whether I just leave it as it is.
If you've gone NC, is that absolutely it for you? Never to hear/speak again no matter what? Could you live with yourself if she does die & you didn't make peace?