I am caught with a psycho girl... I need to get rid of her... I am straight... Help me?

Man! I am in deep ****... I want to share something with u all... A girl(Vanisha) proposed me and she was coming behind me like hell...WTF... I explained her but she is too stupid... She did her studies somewhere in chennai... We met in an accident during our 2008 AIEEE exam... Like she was sitting over side of me... She woked me up during the exam... I passed in that exam... But she scored higher... We became friends... During june, she first proposed me but i said i am straight and heartbroken person... She said she is going to study in pondicherry... I lied to her that i am going to dubai to do college... Thank God! She went to Amity university, Noida since her hometown is delhi... I changed my number... She frequently sends mails but i never reply... I just ignored her because i want her to know what she is doing is bullshit... I like her as a friend... A few months back during 5th semester, she found me on facebook... She read my entire profile and came to know that i am studying somewhere in trichy... She sent me request and her number in personal message... I ignored her request... She started sending me too many mails stating i know u are in india, if u avoid me, i will commit suicide... Then i accepted her request... She started again saying if i don't message her, she will commit suicide... So i messaged her, she automatically got my number... She started torturing me through phone, mails, vampirefreaks and facebook... I deleted her from everything... i did not change my number... So, she still had a chance... She sends like 200 sms per day and nearly she calls 100 times... I still controlled my anger... Then i lied to her saying that i love someone else... She said prove me... I changed my relationship status as complicated and told her to check in FB... Things went on peace... Actually one of her friend, pragya was my childhood friend... Vanisha came to pondicherry for some purpose i guess... She and pragya were shopping... Pragya saw me and whispered to that girl saying Its ashu... That girl said i know ashu and she is already in love... This idiot pragya said to her that ashu is such a dumbo in love and she is still boring single... Here is the big twist! Pragya said everything to me and i said her why i lied... But she never told me that vanisha is here... this pragya told what i said, to vanisha... Today afternoon, i went out roaming in sun... I saw too many bikes... I was checking my face on bike's mirror and i found vanisha coming behind... I was terribly shocked... I pretended walking somewhere... Then i started running through rainbow nagar... I don't want her to know my street address... Then i ran into a house... Vanisha just disappeared... Then i came back to my house... She called me and said that if i don't love her, she will commit suicide... I said i just want to be your friend or please leave me alone... She is still torturing me that she will commit suicide... <<< IF YOU HAVE ANY OF YOUR SOLUTION, HELP ME OUT!