Brize : "She patiently waited for Hero to fail, but didn't actively help MC."
She stood up for him when the others did just stood there and watched. There is a difference between doing what she is able to, and knowingly fighting a lost cause. There is also a difference between doing nothing and maneuvering within the underlying politics. She did what she could until it was a lost cause, the problem is the "hero" was in charge of the party and not listening because he had ulterior motives, she actually had no say in the party members, and would need a reason to give the church to leave the party.
She is basically planning from the expulsion in ch 1 how to leave the party and not get herself in trouble, other then the 2 replacements everyone else was locked into serving in the party by a means that they could not just leave. So she needs EVIDENCE in order to be able to leave.