do this.
DO THIS.
speak to her on msn / get her number / call her up after a few days yeah. just talk about anything until the phone calls.
I hate giving numbers and quantities but make sure you call her at least twice on the phone. when you're out with your friends is better. the first time can be something like "hey its (yourname), tell me something! my friends drunk off his nuts trying to call his ex should I let him?" see how easy that was? or just some social issue that comes up. ask her for some random opinion advice so she gets all tingy and wants to speak. then you say "alright I gotta go now speak to you later" so dont speak to her for longer than like 5 minutes. remember, that whore doesnt speak to you first and you dont want to waste your valuable time on her now!!! so move on........
the next time you call her up, ring her up and talk about some random social relationship issue about ur friends. like what you got up to that night or whatever. just put names to situations (real names) and make up details because guys only focus on sex/tits/ass so the rest is blurry to us otherwise she'll get bored
so anyway after speaking to her for a good 1.5 to 2 weeks, just stop. go cold turkey and stop. if she doesn't speak to you after a few days or whatever, she probably isnt interested. but remember if you share some good times and she values you then she'll come back for more.
if not, well then just rape her in the anus.