"Friendzone" is not some accident that happens to unknowing victims. When a guy has been 'friendzoned', one of the two things happened:
- He has never made an ACTUAL MOVE. By that I mean invite her on something that is clearly a date, trying to kiss her etc.
- She has turned him down or been unclear in her response (which is pretty much the same as a rejection), yet he is hanging around hoping for her to change her mind.
Some girls may be shy or afraid to hurt a guy's feelings and therefore not be clear enough in her rejection. But all of that is solved when a guy makes an actual move. If she's not into you, she won't agree to be kissed, she won't agree to numerous dates, she won't agree to come upstairs.
OP, the girl sounds like she's into you. Just keep dating her and see. Don't be afraid of a 'friendzone', which is bogus. You let yourself be friendzoned if you want to. You are interested in her, and if somewhere down the line she turns out to not have the same feelings for you, cut her off. If you don't want to be "just friends" with her, don't be.
Edit: regarding your behaviour towards her, don't over-think it. I hate it when guys feel like they need to contact a girl less or be less friendly than they want to, just because they have an idea that girls want a jerk. When I'm really into a guy, hearing from him every day has never put me off. A lot of girls (especially attractive girls) has been exposed to a lot 'game' and know this is mainly effort made to increase chances of getting laid or 'experimental' methods. I'll always assume that if a guy is genuinely into me he wouldn't want to risk anything by 'gaming me' - a male friends has also told me he only does that to girls he's not fully interested in. So if you are interested - act like it. Just keep our own life running. And try to be concise with her - when you do contact her, let it be because you want to meet up. Men are concrete and tend to go for what they want. Text conversations get really boring. They always end with one party not bothering to reply and the other freaking out. Talk in person or on rare occasions, over the phone. Internet conversations are ok, but keep them concise, to the point and try to avoid lingering on about schoolwork, or horrors, the weather.