I myself suffer from this character creation compulsion syndrome. Sadly, I'm only really able to write out for Jili, and not other PCs I've cooked up in my mind.
What you need, Eris, is a life-changing moment. Something that would develop Eris, bring her into some divine intervention or moment of truth or inner self realization what-have-you so that you will be able to channel who she is and put that into writing.
I would agree with the part where she seems to be in a crisis at the moment. But I think that's actually a good thing. Self-conflict is a way of knowing who your character really is. The point is not to find "who she is" but instead, for the meantime, "join her journey, and write out how she's progressing as a person". I hope that made sense!
It is so great to learn how deep Eris' character actually is. She's got a good history, you got her attitude/outlook in life down.
I'd drop in some advice though. You know, I did this too, I decided to make Jil interact with people because I thought she's been too secluded/too much of a loner. Every thread was precious. I got to think of ways how my Nuit would react to certain people, I got to form her attitude, her quirks. I was able to see her better "among a crowd of people". Do it. You don't need to socialize in every thread (like what we're doing) you can think up of better conflicts, adventure with other players out there. Go ahead! I can see Eris turning into some sort of pendulum, undecided to swing to the good or bad side of things.