lads, i will keep this short but could do with your advice...cos im stumped

I met this girl of a site, hb8/9 very cute but her pics reaked off pretentiousness. we get chatting and and i use some opinion openers, a bit of canned material, but be myself. so we meet up last sunday and go for a drink and see Avatar, i paid, we had a good night, demonstrated lots of higher vale, i picked her up and dropped her off at home. kiss closed and thought she was a pretty cool girl. She was pretentious, loved going to the top nights in london, loved partying, told me she did coke at weekends (i dont like that much so told her) said some other stuff, like whenever she goes out she trys not to pay with her mates at whatever club she goes to..
she wasnt very intelligent, she was a PA and her interests in life was looking pretty.


so, i email, we meet up tuesday for lunch in london, we go for a coffee, i be myself and have a laugh. she emails before i get back to work saying she had a nice lunch and thanks. we plan to meet tonight (sunday), i said i would cook her dinner etc or go out. then i get a text earlier saying, hope u had a nice weekend, im not sure anything is going happen between us and that she wants to be honest. so, i play it cool, say thanks for being honest and wish her all the best and make a jokensaying not sure i did wrong. she texts back and says i did nothing wrong but there wasn't any chemistry....

so what is chemistry??? what did i do wrong - 2 good dates, made her laugh, negged a bit about her mates with fake tits and said there is more to life than looks etc and stuff. WHICH SHE AGREED and said they are all insecure etc..maybe its cos she is shallow and sees this little world of pretentious places, people buying her stuff, not having to pay to get into places etc. but i played it different but got blown out. any rational - good or bad would be appreciated lads. pretty pissed off. well, she was hot but i couldnt really see it going anywhere with her admitions of coke - drink driving etc. but still feel pissed off i didnt create any what she called 'chemistry' any tips lads on creating chemistry and what u think it actually is??