I met a girl in college in a weekend, we kissed and went for a date once. After this date, i called her just to say I enjoyed and we needed to do it again. She seemed happy and willing this happen.

I dont know why, but after she talked to her teacher in college (the one that leads her final project), she started being crazy and rejecting and negging me. She said she was very very busy with her collage final project (this was true, cuz i saw she refused going out with her girl friends).

When we went on a date we kissed and everything seemed so funny and joyefull! In my car I drove her holding her hand and, once I let her hand do so I could drive better, she left it on my leg all the way home (her home).
I asked her out two times, once i said (after she said she would stay home that saturday) "no!! you shouldn't stay home in a saturday night! Go out, have fun! I can help you with that =). But she said "heheh if I can finish earlier my job yes, else i'll do nothing..."

The other time she said "hhheeeeyy lets postpone to after I finish my job, cuz i'm very busy and everything is so crazy!!"

After these two strikes, I freezed out and stoped talking to her for 2 weeks, and she didnt texted or called me... =(

In the beginning she was so interest and after the day we met we texted each other for hours and everyday... now i cant even keep a conversation by sms (she says just silly comments and some facts of her life, but no IOI...

I cant tell you what happened, but now want that girl! Some ideias? I guess I will text her today, but i need somethinh funny to talk about eheh I already used my entire book!!

Im sure this is going to go over great and reignite her attraction for you. Just kidding.

Why dont you stop chasing and completely cut her off until she re-initiates? Your plan of pestering her for attention and affection isn't going to work.