INFJ. It's obvious. I don't know where you got that S part from. She wouldn't be so physically awkward if she was some S type and she wouldn't be as sarcastic and constantly overthinking and trying to find some general rules ("there I go again, over-planning and over-organizing my over-thinking", "If you think about human nature, our favourite pair of shoes are the ones we bought yesterday, our favourite thing is the newest thing that we have…and the thing we’ve seen the most and for the longest period of time is our reflection in the mirror, so obviously that’s going to be our least favourite thing."). And let me break something down for you - yes, she talks about physical objects in her songs, but that's how symbolism works. She's not mentioning them for the sake of mentioning, but everything means something, she's fascinated with perception (as Ni) so she creates one. She's not writing about things that actually happened, she's writing about things that could happen, representations of certain (already classified) emotions. She's smart and she knows that the public is interested in things that happened to her, not in her ideas so it's always so personal, especially as she gets older because previously she didn't have a problem with admitting that her songs are about things that could happen.
I think far too many people think that
a) you can't even notice what's going around you to be a N
b) life is black or white and people fit MBTI perfectly
b) interviews represent the person, not the persona they're trying to sell you
A few quotes:
"I watched their reactions and emotions, especially to understand what was what I was doing wrong. But then I realized that if I could see these people and take note of everything I saw, I could write a good song."
""Mine" is about the idea of what a relationship could look like if I really found a real one. Because this guy put his arm around me and it was by the water and I literally saw the entire relationship flash forward in that moment."
"I am alone a lot, which is good. I need that time to just be alone after a long day, just decompress. "
"My songs are always inspired by emotions. I break down emotions into like 50 million categories and one big category is sadness. There's the missing-him kind of sadness. There's the frustrated-and-confused, don't-know-why-it-ended kind of sadness, there's the sadness tinged with anger. 'There's the I know we can't be together but I miss you right now, there's the sadness tinged with anger, there's the sadness that has guilt with it, there's the sadness that has a little bit of hope that he'll come back. 'That's why emotions are so beautiful to write about because they all sound so different to me."
A fan asked asks what comes first, the melody or lyrics. Swift, looking elegant, says, “Neither. For me it more comes as a general ideaâ€