i haven't worked it out much beyond that, so this is off the dome based on how the furies operate. i was thinking there was a complaint made by a mortal about your character. it would be something angel would be the one to punish her for, so any moral crime you think would fit her best. basically, angel would've relentlessly tortured her. since she's not mortal it wouldn't be something like disease or death, but maybe an insatiable thirst that couldn't be quenched? she couldn't feed on anyone/anything without being struck with unbearable pain? basically it would be something that would drive her mad and the only way to lift the curse is to complete a task of atonement. like, she'd have to sacrifice her most prized possession or someone she loved (not kill them, but walk away from them and never go back).