For me, it's one of McGuire's gift that she manages to make us see Verity through Antimony's eyes, and that indeed, maybe that pent-up anger is right.
I think that Mindy's priority is to be Antimony's blackbox, because she's the only one from the colony that has been allowed to go with her. Mork is a nice bonus, but Mindy is one of Antimony's clergy, so her first duty is to her.