no dude, u didnt fuck up, yet.
just give it some time. Take a step back, wait a week or two.
however, next time when u start a chat with her or whatever, use some sort of opener.. something like: "jeez, did u know i just got a message saying that u want me to take a test on when i'll get married?!" (u know those tests on facebook) then when she takes the bate u can say "but it's nice to finally meet a girl that wants a serious relationship, most girls only want sex and that's it"
here's an example(this was also a hostess at an exclusive club, this girl gets hit on 24/7, i go to the toilet and she's surrounded with guys who give her their numbers) :
this-is-how-i-got-out-of-her-accusation ... highlight=
of course u gotta use things that are relevant to u and her, or something that actually took place.
The whole point is not to start a conversation with the afc style "hey, what's up? what u doing?" it's too obvious. girls hate that. especially hot girls. Use an opener, a story to pull her in, then run some routines and use bait hook reel RELEASE! u gotta release.
that's how i do it. Hope it helps.
don't worrie too much about it though, she probably just wants u to try harder. whatever happens, keep your head cool.