Shortsie: just saw your question about why she's prickly, etc. I think it's a defensive thing, she would probably rather keep a lot of people at a distance, because some people have disappointed her and she really feels that. It's not that she's prickly a whole lot. Just that when she is, it's sometimes surprised me, or seems a bit much or a bit insensitive. And, she's likelier to be a bit snappy if she's stressed, which I certainly relate to.
She can be quite passionate about things: travel, books, how mean people can be but certainly not in a jumping up and down waving her arms way. I know her better now so I can tell when she's getting more excited about things. I'd say I get more obviously excited about things.
Not sure if it helps with ISFJ vs INFJ, though. I think either could have a cool/prickly exterior, perhaps a bit more likely to be INFJ? I'm not too sure what enneagram she'd be, if anyone wants to weigh in on that it would be interesting too! I think the strongest possibilities are 1, 5, or 6...not sure about wings.