How to get rid of this girl!

Ok I've dated a girl for 2 month. During that two months shes talked about Marrying me, having SIX children with me, and all sort of "fun" stuff. and boy does she go into detail about all this stuff! Not only that shes trained her nieces and nephew to say "Uncle Sean" (My name is Sean). Ok she may think thats cute but I find that disturbing. Now here is where it get scary. She sends nude pictures of herself to my e-mail account and over the webcam. WOW, I have never thrown up so much in my entire life! I mean this is one seriously disturbing woman! Not only that she says this, and I find this disturbing too. "I cannot get over you if you break up with me. However if you die I will be able to get over you." WOW, so I have to DIE to escape her. Ok by now you got the impression that I can't stand her and I even made plans to move and not tell her! I have tried to give her hints I want to end the relationship, but Im this close to coming out and saying it. What is the best way to end this without well ya know, setting her off? Tweet