She's digging on you, for sure. It sounds like the INFJ female is trying to "test" you. Let her ask you out...or at least make her work for it. She does need lots of caring and attention (like a rose), and some tending to. So...if you are open/ready for this...I say "go for it."
An INFJ wants a man who is sensitive and elusive. There are some enigmatic qualities about certain men...that we find completely irrisistable. We don't want what the 99% of the male species think/feel/do...we want that rare 1%. And we will wait to get that rarity.
Summary: You can eventually ask her out...if she doesn't you first. My thought is to wait it out...as INFJ's are quickly decisive about who they do/don't like. And...although she may switch up the vibes she sends out (I admittedly do)...underneath you will see that she treats you differently in respect to other males in the group/class.
The first man to raise a fist is the man who's run out of ideas. H.G. WELLS
The first principle is that you must not fool yourself, and you are the easiest person to fool. FEYNMAN If this is monkey pee, you're on your own.SCULLY