Does this girl like me?

There's a girl in my history class (ok, woman, she's 19) who I have been texting for a week or so. She obviously likes me at least in a friendly context but I don't know if there is something more to it? Let me elaborate. I was talking to her on facebook, and my computer died. I sent her a message along the lines of 'text me at x if you want, otherwise cya in class'. So she starts texting me. I send longer messages but she doesn't reply with like 1 word messages or anything. I ask most of the questions, she always answers them. She uses smileys all the time. Blah blah, friendly stuff.... I asked her out for coffee sometime before class (didn't say x date at x time, just an open invitation), and she said 'Ha my alarm isn't going earlier... i'd be grumpy x) but sounds like cool beans' (she says cool beans a lot).... does it sound like she is actually interested (or even just maybe) and just doesn't want to get up early? or is that her way of saying 'yeah ok but we're just friends'?... sorry for the lengthy post. I suck with women ^.^