Kekeke.
I don't think I'd go so far as to call Aria evil at this point. She's...spiteful and vengeful, but so far she's only indulged in the suffering of Mielle, who 110% deserves it.
She does seem to be missing a big point of her second chance, which is to find happiness, but the story doesn't have to go in that direction and there's still time to if it does.