Why hasn't she responded back?

So i met this girl through a mutual friend. we started talking on facebook and texted for a while until after 4 weeks of messaging i asked her to hang out in person. We did and we definitely had a lot of fun together. we flirted, made plans for the next week, definitely all the good signs of a first date. I then planned something for us and her friends to do the following week, and so i met up with her and her friends and had a good time at like a group event.

The amount of texting/messaging definitely died down the past 2 weeks. Not sure if there is nothing else to talk about or is it because she started to see me in person. And the other night I responded something long to a long text she sent and she hasn't responded yet. Starting to wonder why she hasn't texted back yet. We literally texted each other every single day and she would always respond at least within a 24 hour period.