No, not contacting her for 3 weeks is not the way to go.
Number 1: what happened on the original date where you guys were making out in the back of your car? Did you not escalate towards sex or did you escalate and she stopped you?
Number 2: There's no surefire way to turn it back around. There are a million reasons why a girl might be really hot for you and then cool out. If she didn't respond to 2 texts, just wait a few days and then try again. Something that is not at all reaction seeking would be good. Something like "Hahaha oh my god, this lady in line in front of me is crazy!! She kinda reminds me of you

" Just something to get a response from her. All you can do at this point is keep in contact with her over the break. Doesn't me you have to text her everyday, but just make sure you're in contact and one phone call over the break would be good.
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I mean how am I overreacting? If she was truly interested wouldn't she have texted back??
You're overreacting for a few reasons. First of all, even if she never responds to any of your texts ever again, there are millions of other girls out there. Just like you said, you were on another date. Second of all, I've had many girls who have not responded to my texts and then out of nowhere they respond. Maybe they were busy or whatever, it could be a number of things. I had one girl who didn't respond to my texts for a couple weeks and out of nowhere texted me back and we ended up going on a date the next night and having lots of fun in the back of my car (and not just making out

). So, you're overreacting because you really don't know why she's not responding. You just have to NOT be needy, so back off a little if she didn't respond and give it another shot in a few days.