Yep, Agree with Smith.
Did you sleep with her? If not you should, or at least do your best, keep pushing yourself till she gives in. She must know that you want to have sex with her and not just fool around like a friend.
You should decide what you want with this girl, I assume that you want GF and relationship full of love. If that's what you want, you should setup firm boundaries right from the beginning - she should feel that this is what you want (without you really saying it directly). This will be your frame, all you have to do is stick to it. Don't change it no matter what she does. She will either join you or walk away...
Keep your emotions low, don't get overexcited or overreactive (I don't mean flat face without smiles, rather don't show too much love with your feelings or words. Bite your lips if you have to). Show love with your actions. Definitely no drama, never. Try to invest less into her than she does into you.
You may need patience, lots of it. She may test you, for example, depending on her experience with relationships, everything will be going great, but the all of the sudden she will stop responding, she will cool off her emotions, she may become distant - she just want to see how will you behave. You can't flip, you can't overreact, just keep cool as if nothing happened. Don't chase, give her space, show her that you can be without her without any problems. The more she is into you the less she will test you. She will only test if she has some doubts about you.
Another thing, you should be in charge. You don't have to be giving marching orders, but keep deciding and suggesting where to go or what to do. Don't leave it up to her. For example, she asks: What do you want to do? Don't say "I don't know, it is up to you". Say: "Let's go to A or B". Hey, I saw tickets for decent price to XYZ, why don't we go?
It's ok to offer place A or B, and go to place C as she really wants, just make sure that you do the same next time (suggest another place A or B, this time go to the one you want.It may not seem important or significant at first, but it is in long run.
Take her to different places, make plans... dancing, zoo, Starbucks, bookstore, whatever is around. Girls usually want to explore, they don't want to sit and watch TV. No need to go overboard but keep the excitement and activity going, as well as cool-off/boring periods as Smith suggested. You are not here to "entertain" her 24/7, you are here to live with her. As long as you remain in charge and keep the activity going, you should be ok.
You: It's going too good.. So good that I know it's only a matter of time before I drive the wheels off and crash hard.
>>>>> that is a lot of negative self talk, by thinking like this you are setting up yourself for failure. You are getting anxious about how she will react and what will she do, you care too much, and you are expecting things go wrong. Then something less positive happens and your mind will crash because the expectations were met.... Basically you are Assuming Failure.
Try to change this thinking. Assume Success with this relationship. See if you can self talk in a sense: Things are going really great, and I'll do my best to keep it that way while not chasing. There are always ups and downs in reality, it's ok, no big deal, the best way to deal with it is to remain cool and nonreactive. It could be a great relationship, and if it is meant to be it is meant to be. I am a great guy and doing my best to make things work, and it always takes two to participate and share. I do 50 and she does 50 (ideally you do 30-35 and she does the rest, if you really want great relationship she should be working hard on it, much harder than you)
Something like that. It is also much easier to have a plan in case it doesn't work and she chooses not to continue. Something like: if she breaks up remain cool, non-reactive, don't chase. Walk away, switch to abundance mentality...
I know, sometimes it is much easier to say/write it, but at least you have a blue print to do the best possible things you can...