Maybe you are okay, she just doesn't think of herself as "that type of girl".

She's a bit shocked by your suggestion... maybe it makes her feel unsettled and dirty and obscene and quickens her pulse and makes her breathe more.... so maybe it was a good thing to start getting her feel this way, to break the ice that you are really interested like this, and she is playing hard to get and like such a good girl, so clean and upright, all ready to be seduced. Just a possibility, but you should still probably "apologise".