From my experience. Some are shy. Some are forward.
To my male friend, in the end it is going to be how much of a challenge you are to her world. In fact this applies to almost all women.
Ironically, this is very hard for guys to apply. I still make mistakes that can drive a girls interest down related to this. Best is to live and learn, and try...and yes as an INTJ I can relate how hard that can be with the calculating.
Actually I could go into this for some time, but I don't want to derail the thread. However the last time I tried opening up to an ENFP, even though she wanted to get through my wall (basically told it to me directly to drop the wall), her interest level apparently crashed...big time. I have been "consoled" when I do my head scratching later that she may have been immature or in a bad "manipulative" state by other older ENFP's but yeah, she basically proved to me that ENFP's can be just like every other women and some are not as "tolerant" or "different" then others when it comes to the whole "challenge" argument.
I would just approach it geniunely how you feel but keep her a distance (i.e. dont rush into it fast or you may burn through it too fast) by not seeing her all the time for awhile(maybe a date every 7-10 days, avoid her by being busy after that. Even if you have to reorganize your sock drawer!) . You will know quickly know if she is interested in you (because she will slowly be coming after you since you are staying a far) or not by pulling back. I know some will disagree with me here though