At the end of Changes, Molly was physically hurt, but still "clean" as far as the Council goes. Remember at the end of Turn Coat,Morgan says he said nothing about her backsliding to the Council. Would Luccio even be believed if she did decide to finger Molly because of all the psychological damage done to her by Peabody's ink. So yeah, she could have gone to Eb or Listens,especially if she had Michael by her side when she did it. You could make a whole pig out of all the bacon he has saved for the Council during the war with the Red Court and beyond. Also she could have refused Harry's request to assist him in the first place. Everyone seems to want to treat Molly like she was some victim. She was not, as of Changes she was over eighteen, so technically an adult, and even as a young kid she has always rebelled and had a mind of her own. It was thirteen year old Molly who suggested to Harry as she slipped out of her Catholic School uniform to "tie Susan up first" so he could have sex with her without being eaten in Death Masks. Molly was never some weak willed innocent, actually she is very much a chip off of her mother's block. Both have talent, both rebelled early and got themselves into trouble, both were saved by a shinning knight.. But there it ends because while Charity took the hint when a Holy Knight saved her and let her talent fade, Molly's knight was a wizard. So why didn't Molly go to Eb or Listens? Because she had her own ideas and because when it was time for a wizard to step up to take the Doom with her, the only one willing was Harry, and he was dead as far as she knew. She was also there at the end of Turn Coat, she knows what happened to Morgan, that he was innocent yet the Council wanted him convicted for political reasons.. So that was incentive enough for her not to trust anyone on the Council. Where was Carlos when all of this went down? He told Harry later I think that he chose to look the other way when she was the Rag Lady, but at the same time he could have stepped forward and offered to take the Doom with her. He didn't, now she is some kind of monster as far as he is concerned.
Ghost Story about the coming home to roost? Perhaps, easy for us to moralize while reading it. I think one can argue that it was wrong for Harry to drag Molly into it so he could get out of becoming Mab's monster. However when Harry was in the process of "throwing Molly under the bus" as you say, his vision for his future was distorted and he wasn't playing with a full mental deck. In that moment he couldn't see beyond the four walls of Forthill's office, but then neither could Molly. Harry's huge mistake here happened before that moment, his mistake in my opinion was not giving her the moral foundational training that Eb had given him. That moral foundation about magic, Molly never got it, from the time she screwed with the minds of her friends to the blocking of Harry's memory to assist his suicide, she always felt she could justify it if she felt it was the right thing to do. That is what made her a warlock, there was no rehabbing her from that view point. Her actions with her friends did great harm, but she thought she was helping them, did she ever repent that viewpoint? I don't remember her ever doing that.. She was told not to put her fingers on the hot stove least she get burnt, but she continued anyway and no one forced her.