I'm not sure if I'm an ENFJ or ENFP, but I can tell you that I tend to ignore things/people when I am bored with them. If I like you, I would obviously respond, but also if I strongly dislike you or am angry with you. If we're in a conflict and I'm upset, chances are I won't give you the cold shoulder. In fact, I rarely EVER do that. I can't resist but to speak my mind.
If you are one of those people I wasn't having an interesting conversation with on the first date, and you text me later and say, "Hey, what's up?"...yeah, I will probably ignore you. It's the easiest way to get out of the situation...pretending I'm busy or my phone died so I don't have to tell you that you're boring me...
I guess that's maybe not the best way to handle it, but I have a tendency to do it.
She might have thought you were a nice guy and that she didn't have a terrible time, but she probably wasn't that interested. Now that she's not face to face, she doesnt have to say nice things and put on a big fat fake smile that ends up leading you on (and she KNOWS she's being misleading and feels bad about it)...she can just pretend she doesn't have her phone. If she were really into you, she would definitely reply.....unless by some twist of fate she actually DID lose her phone, lol. Unlikely.
This is what I naturally tend to do. I feel bad about it. I would like to say to someone, "Look, you're boring me. Let's not do this again." But that's just so...harsh.
That's definitely not to say you're a boring person. Different people have different interests, tastes, and familiarities. If the conversation was really an interesting one for her, she probably would have replied back. But being an ENF, sometimes I can fool people into thinking I am really into a conversation when I'm just not. I can't count the number of guys I've led on in my life...and I don't blame them for getting the idea that I'm really into them. It's mainly because I like to encourage people to be themselves and try to have a good time -- I bring out people's personalities. But at the same time, I should really try to tone it down with a guy I know is interested in me when I just don't like him back. It's very hard to do, knowing that I may make him uncomfortable by showing my disinterest.