if you've already been completely straight with her... i mean talked to her like a man and let her know as clearly as possible that it was never a relationship, she's doing too much especially after only 2 weeks, you never made a commitment and (especially after this stalker behavior) you just aren't feeling her like that... not being hella rude about it but just letting her know straight up how you feel and the reason you don't want to talk to her...
if you've already been through that & talked to her like an adult and she still doesn't get it and refuses to leave you alone, you need to just do whatever you can to cut her off completely. don't contact her or interact with her in any way. either change your number or just don't answer blocked calls or calls from random numbers or whatever; if i were you i would just change the number completely though. who cares if she thinks she "won", it limits her ability to contact you and will force her to get a fuckin life.
honestly, it seems like she just wants attention from you. whether it's positive or negative; whether it's your affection, or anger and frustration because she's acting like a crazy bitch, she's still getting some kind of reaction or emotion from you which is what she wants.
if you ignore her completely, she will eventually go away.
don't think about her, don't talk to her, don't talk about her, don't give her any energy.
if you have mutual friends on facebook, if they're her friends just delete them now, or if they're your friends ask them to delete her. sever all ties.