I can't speak for INFJs, but this is a very common frustration for the INFP (or at least for this INFP). We dream and fantasize constantly about people and their relationships yet we have no clue how to interact with real people. INFJs have more finesse in this area. Fe usually makes them less awkward. Which is why personally I think she's INFP.
4w5 sp/so could fit as well:
Enneatype Four | Self-pres/Social
This subtype is the least volatile and fiery of the type Four stackings. They can resemble type One in terms of their efficiency and practicality. Although their focus will be more on the emotional aesthetic, these Fours do have a considerable practical side. Less flashy than some of the subtypes of Four, they nevertheless have a quiet charm and developed sense of style. They are likely to value their possessions, to perhaps collect items of personal emotional significance. They may, for instance, have shelves and shelves of books and have a place for each book. This subtype can also resemble type Six in terms of having a great deal of anxiety. This anxiety often revolves around self-pres concerns such as those surrounding health issues and mortality. Their strong self-pres instinct also lends a degree of independence to this subtype. As the sexual instinct is least pronounced, this subtype of Four is prone to romanticize intimacy without actually pursuing real relationships. When healthy, these Fours can be very productive; when less healthy they might suffer from boughts of melancholy or self pity. The strong self-pres instinct however often helps these individuals to recognize how their state of mind is impacting their health and well being. This enables them to become action oriented.