Ok first off, a chick can't "DJ" you, Chicks aren't Don Juans.
Second, you really have two choices.
1) Go up to her, and tell her strait off your really not that intrested in her, be gentle about it, but it may have to happen.
2) Ignore her as much as possible. I know its cruel, but maybe she'll get the idea. When she starts hitting on you, blatently go off and do something else. She'll eventually get the picture.
Thirdly. What do you care about having a girl as a friend. The only good girl is a girl you can get some p*ssy from, not a friend. The more you have girls as friends the harder it will be to become a true Don Juan. I abandoned all my girl friends when i saw the light, and never regreted it. Just don't be an a$$ about it, because girls talk.
Work on becoming a real man, not an AFC, which you still sound like.
And one last thing: READ THE BIBLE