Interesting you see Misty as an I.
As I said, I'm a beginner so I could be way off! But I pegged her as more of an E. She struck me as somebody who desperately doesn't want to be alone, and is uncomfortable spending time alone. She is constantly reaching to people; bonding quickly with Zoe, clinging to Kyle after he had stayed with her for a few days. Even the very first scene we saw her in, engaged in a religious sermon, seems to highlight her desire to be around people, even people who seem to share vastly different views from her. I'm going by assumption from what we were presented with that this group were a highly devout, even fanatical group of Christians, fanatical enough to burn her on a stake, and from what we've seen, Misty doesn't seem to share much, if anything, in common with such a group. She appears to be of a much more spiritual, nature-based persuasion, yet she attempted to mingle with them anyway. Plus there was her quote of (paraphrasing) "A person isn't their best self until they find their tribe. I just haven't found mine."