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You have some tense issues. "Behind him, sat a woman." (past tense) then "...she stares down..." (present tense).
Some of the sentences are incomplete sentences. "Her posture, in direct contrast to that of the Good Reverend."
"A red mark wraps around her neck, and a heavy chains secure her delicate wrists." Wraps is odd as an active verb unless the mark is appearing in the moment. Usually an inanimate thing is wrapped around rather than wraps. I'd suggest something like "stretches around." "Heavy" is redundant with chains. Chains are rarely light. "a heavy chains" has an agreement problem. A is singular, chains is plural.
"and the Reverend’s clearly dire distress," It hasn't seemed like he's in dire distress prior to this descriptor. Earlier he was described as having a "posture proud with authority..." "full of fire and fury, but steady and deliberate."
Some of the narration seems to be Colette's internal monologue and should probably be in italics to distinguish it from just third person omniscient narration.
For example: "This poor girl has not a speck of magic in her – And the vegetables from Reinette’s garden aside, neither does anyone else within a thousand kilometers."
But then the next paragraph mentions Colette in the third person again.