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cardamome haha you seem to have interpreted the show so differently than i did.
i didn't say there was no difference between Fe and Fi, just that Fi-doms can be so warm, kind and soft spoken that it can easily be mistaken for Fe.
actually it took quite some time before Noora actually went for William, who is in fact not an ex, but Vilde's love interest. i would definitely not call it a quick and easy decision. i actually think she gave it a lot of thought, because throughout the season you can feel her struggle and that she tries to push him as far away possible, but he seems to like her even more because of it (she's probably aware, but still she honestly is very careful with him) and he puts her in a difficult situation and even though she says no to him quite often, she can't deny the deep and heavy feelings she eventually has for him.
i also do not think she keeps it a secret from her friends because she wants to be accepted by society, but because she has a pretty strict moral code(Fi) and fails to live by it and is not quite sure what to do, she's constantly questioning (Ne) and she does not drink and does not have sex because of bad things that happened in her past (Si).
i actually know an (unhealthy) INFP who is actually very very organised, she has OCD, sometimes makes quick judgements and has high expectations of others and pushes people away who don't live up to them to protect herself from getting hurt. Noora kinda does the same, but not that extreme. my friend has been through quite a lot and has found ways to cope and i'm guessing Noora is the same. i don't think that the way she dresses or how organised she is are good arguments for being a J. Fi-dom's might like to dress nice because of self-expression. inf-Te longs for a certain control.
the fact that she got mad at Eskild was also because there was a lot of other things going on in her head and i've noticed when INFPs are stressed out or when they feel their space is violated they become irritated by the smallest things. i can know, my girlfriend is also an INFP.
i would like to see you explain some more why you think she is an INFJ, because i'm an INFJ and i really do not see any Ni in her, what you described what she does when she retreats isn't what i see her doing at all. i absolutely need to retreat myself from people sometimes and i do go through every level of dept of a problem, but the way i analyse things is very rational and with a certain detachment from feeling it subjectively (Ti) and she seems to just sit inside and really dwell on her feelings. also i always feel the need to vent and say things out loud fairly fast, this feels healthy to do (i've noticed this too in my other good INFJ friend). talking too me is a necessity and it's something i actually enjoy doing a lot, i like to describe things and i find it hard to keep things short, but she uses so little words and she finds it extremely hard to ask for help, till there is really no other way possible. oh, and i also don't see any of the other functions in Noora.
oh and with falling in love, atleast with myself and the few INFJs that i know, it's always all or nothing and we're very determined and singleminded (and affectionate) when it comes to love, there is hardly any doubt. i can also see the singlemindedness in William who i think is an INTJ. Noora is actually very indecisive and very private about her feelings.
i actually think ISFJ would even make more sense than INFJ, because of Si/Ne, even ISFP would make more sense because of dominant Fi, but no to me INFP fits the most perfectly, but do correct me if you'd like. i just don't think she's an INFJ.