vibrates...

i could mix both of the first options since she is still in school (and is trying to figure out if she wants to try for college or go straight to work since she has to be out of the orphanage soon), but honestly she'd probably offer to help out at the cafe also since its one of the few refuges she has and its very dear to her. it's a unique area where she doesn't have to be the big sister- or at least not as big of the big sister as she normally is, if she's not allowed to go out without some of the younger kids- while letting her still be productive but also offering relaxation...
this also does put charon in the position of being an adult she actually does confide in instead of her trying to be seen as more of an adult since thats how everyone else is treating her, which is very dear to me (i cannot emphasize enough how much i love charon and sonata seth) (this is a different take on mafuyu but still)

his being potentially unholy disorder is also very good because thats two there she'd know and like now, but also i can already see an arc where she becomes disillusioned with the holy order and this sets up pieces of that beautifully