Are you saying you're not ready to be in that relationship? It's usually easier for people to text rather than talk on the phone or face-to-face so maybe she doesn't like texting or that's just how she texts.. Having known her for 2 years though, is it usual for her to text only a few words? Also, it's only been a week into your relationship so maybe she doesn't want to come off to clingy. When I started my relationship, I limited my texting as much as possible to make it seem like I'm a "busy" person and didn't sit around for his text. I also didn't want to come off clingy but personally, I don't like it when people only send me a few words so I don't do it to other people. So back to where we started, maybe that's just how she texts. You can ask her if she prefers talking instead?
Hope this was helpful!