As i try to look at it from your point of view, it seems as if you need some form of clarification. So if you DO send another message, just ask "so how have you been?" or something along those lines. Keep it short but sweet. If she does not respond that is NOT a bad thing. She is probably just pissed because you took so long to write her back because you are a cool mother fucker now and dont have a lot of time for her.
Im not trying to be mean about the whole situation, I know you have feelings for her but remember, and this is not intended to put you down or hurt you in anyway, being yourself and doing what you thought was right lost her in the first place. Another thing to remember is, whether or not she knows it, she is also playing the game just like you are so again, if she doesnt respond that is not a bad thing.
Again i would also still try and talk to some other girls. Make it visable on facebook.
The hardest part for me in this whole pick up thing is still rejection. At first i got rejected because i was nervouse and talked to fast but now it hardly ever happens (Im not bragging i really need to raise my self esteem). Every time i still fear rejection and worry that they didn't like me and thought I was a fucking faggot or i sucked in bed or something. The point of all this is, and you may already know, that your not alone dude. If things dont work out your not alone. (This will not happen though Im almost positive she still wants your nuts

)