If what Walkaway says when s/he is trying to hurt Left-Behind is an unreliable guide to Walkaway's "true" feelings, then why is what s/he says when the Walk gets lonely any more reliable?
Trying to hurt - intentional.
lonely - vunerable, scared
That's one of the dilemnas here. Weren't we all trying our best, we didn't intend to be here. Boundaries for when she is (intentional or not) inflicting pain/hurt. She doesn't have the tools on how to heal, grow, reconcile or decide right now. That's why you need to lead.
Cliche but some truth in it, "Hurting people say hurtful things." It helps with the spew raincoat if you know she is hurting. Sometimes if you just let her get it all out, she will have talked herself into a solution and you haven't said a word.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.