I'm the first to admit that if a girl won't even kiss you after a multiple dates that there's a problem. Either she's not attracted to you, or she's a cold fish that it will be hell working with.
However that's not necessarily the case here. Believe it or not, there are shy and inexperienced girls out there. If you just spring a kiss on one of these girls with no lead up and no time for them to prepare mentally, you may end up with the cheek through their suprise.
I suggest you ask her out again, and try to lead up to a kiss somwhere in the middle. You take her somewhere romantic and secluded, you stand really close to her with your hand somewhere on her back or arm, you make eye contact, and then you very slowly move in for a kiss, giving her time to process that it's coming.
If you get the cheek again, you ask her gently if something is wrong. Then, depending on what she says and how much you believe what she says, then you may get rid of her. But it's silly to assume anything from your one attempt and to never try again.