So after meeting this girl for a cup of coffee, we went on an official 1st date to a nice restaurant. Ever since the first meeting we were into each other, the conversation went smoothly and nothing felt awkward. IN fact, after the first coffee meeting she texted me saying she had a good time and wanted to meet up soon, so I invited her to dinner. Once again, the dinner went awesome, in my opinion at least, there was no awkward tension whatsoever and we never ran out of things to say. We subtley and directly complimented each other throughout the night, and she even directly expressed that she liked me so I don't have to try too hard to impress her to make her like me. One of the things she said was that her cheeks hurt because I made her smile so much... kind of obvious that she likes me a little bit. Then she committed the first sin, she started talking about her ex! Since the conversation we were having and the mood being so comfortable, I figured it was no big deal, so I kept her talking about her ex. It turns out she was with him for 4 years and only broke up with him 2 months ago! At another point during the dinner, she revealed a lot about her sexuality, that she only slept with 2 men, and that she has or will never sleep aound casually. Very respectable I thought. So the night ended, we went into the car and I gave her a present (box of high quality chocolates) since it was her birthday a few days ago. She was very happy. OK now here comes the confusing part...

Halfway through the car ride, she starts telling me all these stories about her sexual experiances like we have known each other for months, I was thinking WOW, so she is this goody goody girl yet she has the courage to tell me these personal stories. What would make her tell me these things? So we get home I lean for the kiss and it ends in just a peck on the lips. She takes off, the last I heard from her was later that night, she texted me that it was the best present ever! It has been almost a week, I havd dropped about 3 text messages just inquiring how she's doing and wishing her happy holidays... have not heard anything from her.

Is she playing mind games? What the heck is she thinking? What now?

From the start it sounded like she was interested, so maybe things have happened in her life and she is just busy, it doesnt explain her not replying to you though.
Give it a week of not contacting her at all, see if she contacts you, after that week send her a text and ask her straight out if she wants to see you again as you have not heard from her and dont want to bother her anymore if she isnt interested.