Let's assume you've said enough of the right words so far, since she's already gotten semi-naked. Dunno what to do except resist the urge to contact her. It's one of those truths that people used to be comfortable about, but now they aren't, yet it isn't any less true. Girls need to be taught self-respect and self-love early, and so do boys. They will help you develop a charismatic personality and become more likable.
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One major slip up - or even a minor one, sometimes - and you're done. She called me and wanted to have dinner with me late night. I will teach you more than different ways to make a woman feel attracted to you. Telling a girl she needs to make him put a ring on it, is the equivalent of telling her that her virginity should be up for sale.