What was your purpose in doing the 180? Was it to spare yourself pain? If so, just let her know it's too painful for you to keep up that level of contact.
Was it to punish her? Not really a useful reason. Go back to posting pictures of the ids.
Was it to get her attention? Well, you have it now, what do you want to say?
My guess is it's #1, and you need to step back so as not to be sucked into that painful place with her. It's ok to tell her that. Or some version of that that doesn't make her think she has power over you. Just tell her it's too difficult for you to be in contact with her right now, as it's painful to watch her self-destruction.
