I don't know why she changed suddenly?

Met a girl and thought she was great. Will keep this factual. It lasted 3/4 dates only. First was great, we had everything in common and talked until the barmen was clearing up, its the only time I thought I connected with someone. 2 days later (Thursday) we met for dinner, this time there was more touching, more relaxed, better conversation, lots of great eye contact and what I thought was chemistry. She told me that she had been talking about me to her friends and asked me out again the following night to meet her friends for food, I agreed as I liked her and thought that was a sign that she felt the same. The next night was also great, met her friends and got on really well. There was lots of touching from her in front of her friends and even the odd kiss. After, we went for some drinks alone. She told me that no one had ever treated her so well and that she was excited about our dates. She said that when talking to her friends about me, they had said to her that they were surprised because they had never seen her so excited about seeing someone. She said that her friends thought I would fit in well and this made her happy. Honestly all of this was coming from her. She asked me why I hadn't properly kissed her yet and then we kissed. We both agreed that it was all good, we talked about spending the night together but both thought it was best to take our time. She then asked me out again; to come to her house for dinner in two days, her brothers will be there but no parents, again I agree. We both go home, I text her goodnight which she replies 'thinking of you, looking forward to our 4th date, although would rather now refer to them as meetings between two people that care for each other, is that strange?' I reply 'of course not'. Its now 2am ish sat morning (just after that last text) and she then posts on her FB wall that she is 'smitten as a kitten'. OMG I feel for the first time ever that this might work! The next day I speak with her on the phone and late that night she sends me a kiss. Sunday as planned I go to see her at parents house, but this time she's so different. Doesn't really want to talk to me or touch me and I get the idea that she didn't want me there. I leave early knowing there's something wrong and later she tells me she's confused about what she wants. Don't hear anything for another 15hrs when she tells me this is not what she wants, I ask for an explanation because as you can see I'm very confused considering the apparent feelings between us and what she said to me on last date! She bluntly tells me there's no chemistry and that's it. I'm really not a fool and have been around and I know how it felt. Honestly all the stuff she said sounded genuine, everything was so good, her body language, subconscious things like touching and what she was saying, asking me out again to meet her friends! Why has she changed her mind so suddenly? Hows it gone from saying and acting like that to nothing? Is this weird or is it me?!
I don't know why she changed suddenly?
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