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My question to you is: is there a way I should go about to break this AFC impression she may already have of me? Or am I thinking too much about the situation?
If you changed your behavior from AFC to a more mature man, then from my experience it could be done if you didn't see each other for some time (one year or more)
I would slowly start flirting with her on FB chat. Not too often, perhaps like once in two or three days. Have a conversation that is light, flitratious, some C&F style. Try to do like 1 - 2 hours each time.
Then ask her to join you and your friends for some fun party. I usually organize bowling for about 20 friends. That way you can show her how cool friends you have and also that you are their leaders, cos' it's you who is organizing it.
BTW: Make sure there is some female friends as well, not only you and your buddies. That way you also have preselection from the females and eventually some jealousy plotline.