I don't know what to say about your situation. I can be somewhat of a friendly sourpuss and do stuff like your friend did so I've got no real defense.
In my case, it wouldn't have been a flippant blow off, it simply would've meant that I didn't really want to talk to you and I tried to do it "nicely," i.e. by exchanging emails if you asked for it, maybe even phone numbers, giving a non-committal (or what I hope is understood as non-committal) "maybe we'll talk later."
I strongly believe in allowing a person the opportunity to escape a situation gracefully with as little drama as possible. If she's is trying to escape gracefully, you're not allowing her to do so. I know people are always advocating direct communication and the "just tell them!!" approach but that is often difficult in situations like this. I don't want to watch a guy's crestfallen face if I have to say to him, I'm not interested in taking this conversation or interlude any further and I don't want to give you my number or email. Now I've taken to telling people "Have a nice life! " because I don't want any misunderstandings to occur and possibly be the source of discontent on an internet thread.
Have you considered that she just isn't that into you and isn't responding to you as enthusiastically as you'd like because of this? I guess to me there are some things you've just got to understand and pick-up on with how people communicate. People say things like "I'll see you later" "Let's have dinner sometime" and "I love you, I want your children" without really meaning it. I personally, work on distinguishing when people mean their statements or when they're just saying them to be cordial and un-prickish. Because for some odd reason I have this feeling that if you I told a person 'I don't really want to see you again unless it's casually with groups of people around,' it won't be well-received. But believe it or not, I may completely not mind seeing them again because I thought they were fun, but I don't want it to get any deeper than casually hanging out.
If you think there is some romantic interest, why don't you ask her out? Personally, I think you can string a person along forever via email, Facebook, and texts and those are not reliable methods of assessing interest. Ask her out for coffee or some other relatively low-stakes way of assessing interest because when you're in person you can tell these things better. If that goes well and you get a good feeling, then ask her out again. There's probably a universe of non-verbal communication happening between you two and very important detail that are being left out. What can we here know about what this person is thinking? What does saying she's an ENFJ tell us (nothing really)?