..............that's really weird, John. Do you just post that on the slimmest pretext? O.o It's odd to say "she's just your friend" then post a compatibility test....

I saw her again this afternoon. She joked with me a couple of times and I made eye contact with her for about 4 seconds when neither of us were talking. She also came up to me twice and stood almost touching me when we were listening to someone else speak, but she didn't say anything to me. If she is interested she is probably being subtle because I am. I will try to talk to her more.

Okay, i'm DYING to find out how this story ends!!
I myself am en ENFP, and, i do agree with alysaria that we are extroverted (ofcourse, it's in the name) and with that rhyme she said, but i would also like to add that i myself never had a relationship up 'till now, and that makes me very uncertain about myself.
I would probably act like the girl you're describing, einstein, just because i would doubt somebody could be interested in me that way, certainly if he doesn't give any clear signals.
I'm a very open and enthusiastic person, but when there's a hint of something more between me and a boy, i get very shy. I would respond very well if he would send me a signal, for instance, there was a friend of mine who kinda flirted with me lately, and i went with it, i flirted back and stuff, but i NEVER asked him out or stared into his eyes or anyting like that, just because i was too shy.
What i would suggest is that you should ask her out, casually, don't make it sound like a date (it creates too much expectations and she might be scared off by that?), and see what she says. If she wants to, great for you, keep asking her out until you find the courage to make a move or until she does, if she doesn't you know and you can stick with staying friends like you were.
And let us know how things went!!