Well, despite the initial harsh treatment, at least the priestess apologized and made up for it with the golden card (worth 100 gold coins, keep in mind that Harris had to work hard and risk his life only to get 5 gold coins) and she also took care of the girl and didn't try to manipulate her to hate Harris (she could do that when they both were alone).
Because the Priestess could easily double down and accuse Harris of mistreating the girl, and due to his stigma he could be in trouble, so yeah, I do agree she's not the best and Harris is right to not stick around her, but also she's not the worst character.