Why does this girl never reply to me?

I have been on 3 very successful dates with this girl already. First was a coffee date, second was a movie at my place and I also cooked us dinner, and third I picked her up to get some Mediterranean food and just hang out. Hooked up on both 2nd and 3rd dates. We spent nearly 7 or 8 hours together on the 2nd date, it was amazing. At the end of each date I walk her up the steps to her house and she tells me she had a great time and loves spending time with me and such, then hugs and kisses me before she goes in. My only question is why does she never reply to my texts? I don't spam her phone, I text her either once a day or every other day just to stay in touch or plan the next date, and in the rare chance she does text me, she barely says more than a few words. Think I'm worried for no reason here? I really don't feel as if I'm smothering her, but a woman's opinion would be nice.

Oh yeah, I've never called her over the phone before, mostly because I don't wana disturb her at work