Your world sounds lovely. Very <PERSON>-like.
One option is that the girl creates fate. She doesn't know it, as everyone believes that fate is created by spirits or the universe, or that each person's fate has been there all along for them to discover.
The fate she creates unconsciously for other characters could be based on how she feels about them, or what she wishes for them. 128
That can be good and bad.
Of course the Fate she creates would become more pronounced or immediate around the <PERSON>.
Her character arc could include "beats" like this:
* She thinks she is just seeing Fate like <PERSON> do.
* She discovers that she creates fate for other people, based on how she feels about them. She might discover that by changing how she feels about a person, and seeing their Fate change suddenly.
* She can't handle it and tries to become a hermit.
* She realizes that it is powerful, and potentially useful, and returns to her society.
* There are people she thinks are evil, and therefore she keeps creating bad Fate for them, and she feels terrible about that.
* At the end she comes to understand the people she thought were evil, and discovers they are just misunderstood, and is able to then create good fate for them.
* She can also start to show people that they can create and control their own fate, though she is the first one to do it so powerfully.
There are probably plenty of other "beats" in the story:
* She confides in someone who promises to keep her secret.
* The secret comes out. People who find out about it go nuts - some celebrate it, some get enraged that she is creating bad Fate for them, some just get afraid of what she could do (even though she's really sweet and loving).
* When she is alone in her self-exile, she suffers from loneliness and has a hard time creating shelter, finding food, etc.
* Someone in her society tries to defend her when she returns.
* Other characters start trying to control their own Fate, or the Fate of others.
* She learns how to control her own Fate and guide her own future.
* She becomes a teacher of her magical self-determination. 38