Also her stance on second look is clasping her hands
Plot twist alternative theory: she's actually a mole and the ring is a hidden cam (notice she's slightly pointing it at the meeting; also notice she's actually the only one wearing a ring, the other members don't seem to have a ring).
Or, she's a double agent, snitching the group to the police so the leader gets jailed, the cult is declared over, only for her to silently restart the cult as the new leader.
Another theory: notice how there were originally four cloaked figure, but there's only three cloaks in the sequence. The two explicitly cloaked are bald and wear glasses, and so does the woman who discarded her robes. There's no other bald person wearing prescription glasses other than the policeman clicking the handcuffs into the kneeled down cloaked figure, something tells me he's the leader because he's seemingly calmer than the other being walked to the police car (who's visibly sweating out of anxiousness)... Or is this seeming calmness from the leader actually the knowledge that the cop with prescription glass is a member of the cult, who's playing cop to somehow benefit/alleviate to the cult and/or to the leader.
In any case, I loved this "Cicada 3301" spirit imbued into this comic strip. It brings me memories...