Actually, just like Soar337, when I first heard her songs I also thought she was INFP, because a lot of her images and visions perfectly resonated with my own imagination; therefore I wouldn't say that this is what distinguishes Ne from Ni (even though I'm far from being an expert on this). However, later I found that even though the
form seemed very familiar, the
content somewhat did not. I hope this won't reveal any deep prejudice on my side, but it seem to me that NFJs I know seem to have a different view on love and relationships than NFPs I know (including myself).
It seems to me that young NFJs seek very deep and mysterious passion, and when they don't see this 'perfection' in their love interest, it's either quite hard for them to truly fall in love with that person, because they don't find them 'worthy' of their deep love, or, when the relationship is already established, but 'the magic has gone', they move on and seek for the magic somewhere else; and that is what I see reflected in Natasha Khan's lyrics.
I realize this is very arguable but from what I've observed, INFPs have a tendency to become deeply loyal to their parner over time even if they find out their not 'ideal', because they will overlook their mistakes and deeply focus on their qualities, which is what prevents them from 'moving on' to seek another 'ideal'. That is perhaps why Khan seems a little 'flighty' to me, even though she's certainly not.