So Paladins do serve under a deity. Only problem here is Minthara, she is a paladin that abandoned Lolth and there is no way she gains her power from the absolute or Orin for that matter. Only fix here would be to make her an oath breaker, but the problem with that is she already has dialogue stating her vengeance oath.
Yeah, that's silly/odd. Once she is recruited Goblin Slayer with Scottish accent should appear ...