I have spoken about the centaur woman elsewhere recently, but to summarize some points that have not already been mentioned:

Do not expect to sway her with words, or at the very least not with meek or paltry arguments. She is impressively stubborn, and she seems strongly set against the Kenoma since she can blame it for the death of those that she cared for back home.

She also seemed relatively uninterested in collateral damage when fighting against us, so do not believe you will be able to distract or discourage her with any threats to nearby structures or individuals.