I don't have any reason to doubt her but I can't speak with any authority on what her intentions were or weren't. If that's true, and she was manipulating you to get to know you better, well, OK. Would you prefer to be ignored or not shown an interest on any level? I doubt it. And if there were repercussions from being "duped" by her, all I can say is that's a risk you take when chatting to strangers online. I can say is that I, personally, have never known her to be deceptive except ONCE many years ago when I had not been on this site for awhile and when I returned I was using a picture of a girl I knew as my avatar. Viva, not knowing it was me (we had known each other some time prior) chatted me up online behind the scenes, probably to get to know me and/or get nudes. Then I told him (at the time Viva was identifying as a male) who I was. He felt I'd been intentionally deceptive, and freely admitted he had been, in his motives for talking to who he THOUGHT was a hot blonde chick. We made up and moved on, amicably. So is it possible she manipulated you? Sure. But I don't know and it doesn't change my take on you publicly disseminating your correspondence with her.
In a way, yes, that behavior would be a betrayal of your trust but that's on a totally different level than spamming somebody's private emails -disingenuous or otherwise- to fellow posters...i.e. somebody chatting you up for the hope of nudes/info/etc. under surreptitious circumstances is different from reading somebody's private letters out loud. Totally different. The former is sneaky; the latter is scummy. If you felt wronged by her, cut ties and move on. Don't air your drama publicly. You asked for my take on it and that's my take on it.
I can't keep repeating myself so I'm going to move on.