I'm confused, what behaviour of hers should suffer consequences? You ended things, she moved on and is now being civil when she sees you in public. Seems perfectly reasonable behaviour to me.
Also, I'm deliberately ignoring the 'daddy issues'. Now that you are no longer her boyfriend, all she owes you is civility in public. Her problems and choices for continuing in her life are no longer relevant to you.
I saw in an earlier post that you want to help her. I strongly urge you not to do this...I can't imagine any person wanting unsolicited advice from an ex.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.